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How long to charge a battery at 2 amps


how long to charge a battery at 2 amps How long should I charge an average battery (2006 VW Jetta) in order to obtain a full charge at 10 amp and 25 amp settings. Charging over 2 amps can result in a dead or exploded battery. After this time it will have a voltage of 4. Select the charge current according to battery size. 10 amps are the recommended current. Nov 11, 2016 · The bigger the tank, the farther you can go. Larger chargers may be used to decrease charge time, but may decrease battery life. The capacity of rechargeable batteries is commonly measured in Amp hours at a 1C rate particularly for Li-ion chemistries. It is better to convert capacity from milliamps into amps. Feb 18, 2015 · Long answer: Assuming the system is 100% efficient, (i. A 10 amp charger, on the other hand, will take 5 hours. Lithium-based batteries (lith ion, lith-iron, lithium phosphate, etc. Meanwhile, the same battery may safely provide 36 amp hours for a period of 100 hours. As the rotor spins, the . A battery rated at 150 minutes can operate a 25A load for 2 1/2 hours (at 80°F). Re: How long can I safely trickle charge? Yes it probably will be safe to leave a 2 amp trickle charge on your battery overnight without hurting the battery. Charging a normal car battery with a regular car charger of around 8 amperes can take 12 hours or even a whole day to fully charge it. Mar 09, 2021 · 8. 2 volts is 50% charged 12. A marine battery that is capable of providing 100 amp hours would need approximately 50 hours to be restored to a full charge at the rate of 2 amps per hour. The best way to maintain a long life for your car battery is by recharging it . Or 1/2 amp for 2 hours, or 2 amps for 1/2 hour, etc… May 22, 2020 · The current Tesla Model 3 Performance, for instance, has an 11. Apr 07, 2021 · Reserve Minutes indicate how long a battery can sustain a load of 25 amps before it drops to 10. But the real issue with battery chargers is a thing called battery “acceptance rate. 53 hrs + 2 hrs = 5. A lower flow rate is better for the battery and may reduce the damage if it’s connected to the car for too long after the battery is fully charged. For instance, at C/5 a battery might safely provide 26. You will likely be tempted to find a battery charger that charges at a much . Review the . Jun 17, 2021 · These chargers supply a lower amperage (2 amps or 4 amps) so they can take up to a day or two to fully charge the vehicle. 0Ah battery in 1 hour. This means that if you have a 2 amp battery charger it would take you 48 hours to charge your car battery. To boost your battery enough to be able to start the engine, it would take around 2-4 hours. 0Ah battery should last for 2 hours in the same electric mower. 40). 1C, 6A and 15h. 5 to 2 amps, which means that your battery charges at 1. With that being said, a basic car battery charger at 2 amps will fully charge a flat or empty 48 amp hour battery in 24 hours. A battery kept in a good state of charge will last much longer than one left standing for weeks or months on end with a low state of charge. An alternator isn’t like a DC generator with a permanent magnet. 5 battery and a solar panel 6V and a trail Camera 1000-2000ma how long will it take to charge the battery or can I put a 12V solar panel on a 6V Battery and the camera will it blow it up or not the 12V solar panel vpm-17. Basically, this denotes how long a battery will last if it isn’t recharged. May 10, 2021 · Ah, or ampere-hour is the total amount of charge your battery can deliver in one hour. A marine battery charger needs to be rated at 1. The most basic car battery chargers will offer a charge at 2 amps and because the amperage is so low it will need at least 24 hours of charge to deliver the 48 amps your battery needs to completely charge if it was totally flat. Other 12-volt, 2-amp chargers and maintainers will also work. no resistive losses in cables, or internal resistance from battery) Power (Watts) = I(Amps) * V(Voltage) Therefore, Amps = Power/Voltage 50/12 = 4. They usually supply a continuous stream of power (known as linear chargers). If you are using a 10-amp charger, your mower’s battery should charge in approximately one hour. Mar 30, 2020 · A: If you leave the charger connected continuously, even at a mere 2 amps, the battery eventually will die. 0 volts is 25% charged 0 – 11. Amp-hours (at 12 volts) = watt-hours / 12 volts = 1470 / 12 = 122. How long to Charge a Car Battery at 10 Amps. 333 (hours), or 6. 2. On average, car batteries hold 48 ampere-hours, so it typically takes a full day to charge a car battery. Jan 21, 2021 · Charging a battery with a car battery charger enough that it can start the car engine will take around 2 to 4 hours. 2 amps and the voltmeter shows 15. A 10Ah battery at 30 percent charges at about 3A; the percentage can be lower. 06 hrs * 50% DoD = 3. 220 amp hour batteries explained. A U1 lawn tractor battery will charge just fine at a 10 amp rate. Apr 28, 2007 · Apr 28, 2007. 5-5. 9 volts is Discharged (Flat) Since watts = amps * volts divide the watt hours by the voltage of the battery to get amp-hours of battery storage. Plug the battery’s capacity into the equation and multiply it by 1. 0 amperes (amps) of current will drain the total charge of a 2. 5 amp appliance for 1 hour. 0Ah battery uses just a single row of 5 cells. If your capacity is represented as an amp per hour then keep current is amps. 4 volts is 75% charged 12. An economical choice is the 5 amp per bank . Here is a second example of how long to charge batteries but this time for charging 1800 mAh 1. I would like to know how long I should leave the battery charging on the car battery charge if it is set at 2 amps. Oct 22, 2020 · Charging a car battery — 4 things to remember. If the battery is not warm after the 5-minute re-charge then charge the pack for an additional 2 1/2 minutes. 2) ÷ C-rate. 5 to 2 amps per hour. If the battery is not warm to the touch, recharge it for another five minutes. It's been there for 3 hours and the "charge complete" light has not turned on. However, when charging an automotive battery, 10 amps or less is considered a slow charge, while 20 amps or above is generally considered a fast charge. For example, a 100 amp hour battery with a 10 % discharge would need 10 amps replaced. For example, the Minn Kota Digital Charger is available in a 2-bank model, with outputs that vary between 5 and 10 amps per bank. 2 volts is 100% charged 12. The larger the battery, the safer it is to charge at high amps. Simply put: A battery with a rating of 1000 mAh should be able to provide 1 amp of current, for 1 hour. What Happens If You Leave A Car Battery Charger On Too Long? Apr 12, 2020 · The amount of time required to charge a 12-volt battery largely depends on how low the battery is in energy. Step 2: Connect the red probe to battery positive and the black probe to battery negative. May 14, 2018 · During a power outage, assuming you have a fully charged home battery, you will be able to use almost all of the 10 kWh of stored energy. It's necessary to put about 36 amp hours, plus 15% more to compensate for the internal resistance in the battery, for a total of 36 amps + 36 x 0. But there’s more to the story. 5 amps. Charging a Leisure Battery. You see, the 5. Feb 15, 2020 · Charging your battery this way often requires a battery to be charged beforehand by an amp charger. 5 amp hours of battery power. I will discuss how I calculated the numbers for a simple formula that will give you a solid estimate on charging times for any car battery and using any amp . Most battery chargers send about 2 amps of power to your battery per hour. If a battery is rated as 100Ah, it will produce 100 Amps for 1 hour. Aside from jump starting (the fastest, but not always the most efficient method), you can also consider using a reliable car battery charger . May 25, 2017 · Step 2. Keep-Cool battery technology keeps each cell cool for long life and work in the most extreme conditions. Determining whether to use a 2 or 10 amps charger will definitely help you to predict the charge time of a battery accurately, but there are several other factors as well that . 10 amps or more. Mar 15, 2021 · A Level 1 battery outlet charges at 120 volts, while Level 2 chargers can plug in places where you would usually place larger appliances like refrigerators or washing machines and charge at 240 volts. Then find out the current for a . The reason for this is that the car battery is originally made up of 48 amps of volt and it takes consumes 1 amp of charge every single hour. Oct 08, 2020 · Giving the battery a charge every 12 weeks is a good standard to follow. Repeated fast charging could overcharge your battery. Now go back to Steps 2-4 . Mar 19, 2021 · For example, if you have a 50-amp charger and a single 100-amp hour battery, d ivide the 100 amps by 50 amps to come up with a 2-hour charging time. Therefore, this type of charge is often used as a trickle charge or for maintaining your battery at probable charge and not trying to get a fast charge to boost your battery . For example, charging at 5 amps is fast for a 10 Amp-hour battery, but…not so fast for a 20 Amp-hour battery. youtube. Jul 01, 2019 · If a battery is bad, it won't hold a charge—no matter how long you leave it hooked up to another car or charger. Aug 27, 2021 · The Makita 2. 5Ah battery uses industry-leading ARC Lithium™ technology to deliver Power Beyond Belief™ and is compatible with all EGO outdoor power equipment. If the car battery doesn't hold a charge, you'll need to tow your car to a place that can fix the issue. So for a 10 Amp-hour battery it will take a 5-amp charger a little more than 2 hours to charge your pack. Apr 11, 2020 · A basic car battery charger usually charges at 2 amperes. How long will it take in charging a deep cycle battery 2 amp or 10 amp? Ans: Charging the deep cycle battery in a 2-amp charge will take a long time, and the discharge time is more than the amp charge. 50v or higher then replace the battery. 5 kWh battery, while the Model 3 . Do not overcharge your battery! We recommend charging your battery at no more than 2 amps. E. Sep 10, 2021 · Typically, for a 48-amp battery, it will take about 24 hours before the battery is fully-charged, provided that you started when the battery is dead. Calculate how long to leave the battery on the charger with (C x 1. Set the charger to the highest setting. 3. In order to determine how long it’ll take for you to charge your battery, you need to know your battery’s reserve capacity and . So by your using 2 amps at 24 hours on a 'low current' battery charger - would give you a charge . 6 (hrs) May 16, 2016 · The easiest way to determine the appropriate battery charger is to use 7 - 10% of the rated amp-hour capacity of your battery. The low amperage charge also keeps the battery from overheating. Adding battery storage to your solar installation is a great way to take full advantage of the benefits of renewable energy to increase your quality of life. 5 volts under different . Figure out what kind of battery you have. The C rating tells you how many amp hours the battery can provide for a very specific period of time. #3. Starting batteries aren't used to handle loads for long periods, so reserve minutes are less critical. So by that logic, a 4. The power and longevity of a battery is noted by its Amp Hour (Ah) rating. Battery chargers will charge a battery based on its condition and at a rate appropriate for its state of charge. Nov 28, 2009 · Charger 101. Is it better to charge a battery at 2 amps or 10 amps? It is best to slow charge the battery. The first step is bulk charging where up to 80% of the battery energy capacity is replaced by the charger at the maximum voltage and current amp rating of the charger. The EGO POWER+ 56-Volt 2. Sep 15, 2011 · Depending on the physical size, a "deep cycle' battery may have 80+ "amp hours" (1 amp per hour at 80 hours) of storage capacity. Basically the higher amps will allow you to charge a battery in a shorter period of time. 5. For example, if you have something that draws 20 amps, and you use it for 20 minutes, then the amp-hours used would be 20 (amps) x . An Amp-Hour is one(1) amp for one(1) hour, or 10 amps for 1/10 of an hour and so forth. Charging voltages run from 13. 4 volts this begins the absorption charge step. How to store a car battery. The 5. 0Ah battery . 2 volt NiMH aa type rechargeable batteries and with the same current chargers: 100mA battery charger: 12 : 1000 = 0. Hook up your battery with the provided alligator clips. This chart provides on average what the charge times will be. That means you have to start charging your dead car battery with a decent battery. 22 hour recharge time estimate. But with a 10-amp charge, you can charge the battery in 15 hours. 2, or 120%, since NiMH batteries require more power to charge than what they output. So to charge a deep cycle battery at 2 amps from a "discharged state", would take around a couple of days (48 hours). 012 0. For an effective charge, you need to make sure that the panel is directly facing the sun and no obstacles in between. When a battery charger says it is charging at 2 amps or 10 amps it is describing the number of amps it is delivering to the battery per hour. 5 volts for most applications. a 1 or 2 amp "smart charger" can be used for battery maintenance between higher amp cycle use. When the battery voltage reaches 14. 5 volts. Charging your battery at the 10-amp rate is fine to get your battery back into service. I have a 12 volt car battery charger with a selectible 2 or 6 amp switch I am going to use to charge the field battery with. If you have a 4 amp battery charger it will take you 12 hours to fully charge your car battery if it’s completely dead. A highly discharged battery may take up to 12 hours for it to be fully charged. 0Ah pack uses two rows of battery cells attached to each other with a parallel connection. 33 Amps the camera 1000-2000 MA converter on it 2. Jan 12, 2021 · A 2 amp charger delivers 2 amperes of current per hour to the battery. If the amps show low. Wait. May 18, 2021 · Charging a car Battery 2 amp or 10 amp. 5-kW charger, which can take full advantage of a 240-volt, 50-amp circuit to recharge its 80. Mar 20, 2019 · Many battery chargers deliver two to six amps (some allow you to choose the amperage level) and will take at least several hours to recharge a dead car battery. 40V (6 x 2. If you know the load current, that is, the amount of current your device uses, then divide your 2Ah by your device current in Amps to get number of hours. Smaller chargers are fine for long term floating, e. Or if delivering 10A, it would last for only 1 hour, or if delivering 5A, it would last only for 2 hours. 12. The advantage of this relatively low charging rate is that you’re less likely to overcharge the battery, which can reduce its overall lifespan. The exact amount is not usually critical. I have not had good luck with any type of 12 volt battery. Thus, a 100 ah battery would take about a 25 amp charger (or less). Step 3: Charge the battery at a 10-amp rate. With a slow charger, it takes a few hours to fully charge a battery, depending on the charged left in the battery. 0 Amps. Another example is i f you had five 100 Ah (amp-hour) batteries for a total of 500 Ah and a 100-amp charger. All Deep Cycle batteries are rated in Amp-Hours (AH). For lead acid, this is between 10 and 30 percent of the rated capacity. Mar 11, 2021 · In a nutshell, charging rate in C-units means how much of the battery’s max capacity is restored each hour, charging current in amps is what produces the charging rate, and charging time means how long it takes to reach a full 100% charge. While still charging, test the voltage with the DMM. So, in this example, it’d take about 5. For example if a battery is rated as, say 8Ah, it will be able to provide 4 amps for 2 hours. Using the example above, it . However, when it comes to navigating the world of amps, volts, and amp hours, it can definitely be confusing. 8 and a capacity of 2. I am assuming the battery has water in it. Using a 5 amp charger, we have 10 amp hours divided by 90% of 5 amps (. . Step 3: Read voltage and charge battery if below 12. 5 Ah Sometimes manufacturers may prefer to display the data slightly differently by stating how long it takes the battery to go from, for example, a fully charged 12 volts to 10. A 2C battery would need just half an hour to load 100 Ah, while a 0. ) Sep 10, 2021 · Typically, for a 48-amp battery, it will take about 24 hours before the battery is fully-charged, provided that you started when the battery is dead. 67 AH. A 10 amp charger, in comparison will take a little under five hours to fully charge the 48 amp battery. By providing a slow charge, your battery’s life will be maintained for a longer period of time. Apr 29, 2017 · It was mentioned that this charger will not charge a dead battery but normally if the voltage drops below 8 volts and especially in freezing weather the battery will have to a certain extent been damaged. If the battery is deeply discharged, 15-30 minutes on a 40-amp charger will provide charge and give the alternator a chance to finish charging the battery while driving your car. Feb 18, 2021 · Using a 2 amp charger will take you quite a long time to charge your car battery at an acceptable level. 3 Amps ISC. If you are using a different voltage battery the amp-hours will change by dividing it by the battery voltage you are using. 20 amps are already fast charging. To calculate that, the charging rate of the battery charger is 2-amps per hour and it will take around 24 hours to flow 48 amps into the battery. 012 x 1800 = 21. Now, let’s consider amps-per-bank, and here, a larger number means a faster charge. How Do I Recharge My Car Battery | How Long To Charge A Car Battery At 2 Ampshttps://www. 0Ah pack actually has more than double the amp hours of the 2. For instance, if it is a 100 amp-hour battery, the voltage should be maintained at 2. If you charge a 12-volt battery with a trickle charger that produces 1-3 amps of electrical current, it will take 20-24 hours to charge it. The reason why you cannot use 100% of this energy is that due to the chemical composition of many home batteries, there must always be a minimum charge present. Turn the battery charger on and let it charge as indicated . 16666A Assuming that the battery is fully charged, then it will have the full 40AH capacity. 3 VDC VOC-21. Throw away how long will a battery last calculator, and l et’s see an actual case, 10 Ah battery delivering 1A, would last 10 hours. The blower motor and related 12-volt components of your propane furnace draw 7 amps while running. C-rate is used to describe how fast a battery charges and discharges. 4. 5 amp-hours. Using a Charging Station. Jul 16, 2009 · One such charger is the UPG dual stage charger. 0. 4V Battery charging time. An alternator needs at least 12-volts and at least 2-amps to create an electromagnet field. Stage 3: Float mode. That is given below. a 1 or 2 amp "smart charger" can be used for battery The 2-amp charge rate is intended for small batteries such as motorcycles, snowmobiles and lawn garden tractors. 53 hrs. There is an easy & simple formula to calculate the ideal charging time of a lithium battery. Float mode is where the voltage on the battery . Lastly, Remember that batteries contain sulfuric acid that can cause severe burns, and hydrogen-oxygen gases that can be explosive. Double these times if the battery is fully discharged . 3 VDC IMP-0. Sep 17, 2020 · Multiply the charge time by the battery’s depth of discharge to estimate how long it’d take to charge the battery at its current level: 7. Oct 14, 2017 · Recharge time can be approximated by dividing the amp hours to be replaced by 90% of the rated output of the charger. What to Do If a Car Battery Won't Hold a Charge. I have a batter charger with 10 amp, 25 amp, and boost settings. This means that a 2 amp charger will take 24 hours. This is a slow charge. ) need special chargers depending on manufacturer, which brings us to the next step. Aug 23, 2021 · Before asking how long it takes to charge a car battery, we have to look at the methods designed to make the charging process as quick and smooth as possible. 5V per cell until the current decreases to 1-2 amps. Lead acid, absorbed glass mat (AGM), and gel batteries can all be charged in the conventional way. There are automatic chargers that have a switch for dead batteries. 9x5) amps = 2. You may have to recharge the pack a couple more times if you're charging a hi-capacity battery pack on a charger with a charge rate that's less than 4 amps. Under ideal conditions, a cordless lawn mower that continuously draws 2. 8 amp hours. This will help reduce wear on your battery and allow it to better hold its charge in the long run. Wait until the battery has a full charge before disconnecting the charger. 40V, set the voltage to 14. Sep 13, 2019 · The third row tells us the battery can power a 2. At the point where the current is reduced to C/50 to C/100, the battery charger enters float mode. A car battery is typically 48 amps. So, if your battery has 48 amp hours, that simply means you need to charge your battery for a whole day (24 hours) in order to fully . Marine stores are the best place to . For a car battery in most cases, it is okay to use a 10 amp charger and is normally the recommended amount. When using a portable charger disconnect your Deep Cycle Marine Battery from your boats electrical system. I have a 6V 4. Step 3. e. If you expect your car battery to sit unused for more than a month, you should consider removing the battery and storing it away. Three-stage automatic 12-volt battery chargers are the most recommended for efficient charging. 7 – 13. Chargers that allow you to set the voltage and amps and then charge for a specified time should not be used, because an overcharged battery can be damaged or will explode. Nov 13, 2019 · An incandescent 12-volt ceiling light bulb has a draw of 1. The service life of a leisure battery depends on how frequently it is discharged, how deeply it is discharged and how soon it is recharged. Find the 2-amp setting on the 12-volt charger. 9 volts is Discharged (Flat) Feb 28, 2014 · In other words, it needs power to make the electromagnet in the first place. It's time for a new car battery. Charging Time= Capacity/Current. RV's stay plugged in for months with a 1 1/2 amp trickle charge running. If you have digital muti meter, you can diagnose the battery yourself. If you leave the light on (burning) for one hour it will consume 1. How to charge your battery: Set your battery charger based on your needs. How long does it take to charge a battery at 10 amps? To fully recharge a vehicle battery at a 10-amp charging rate will take about 5 hours. 5 hours to charge . Battery Trickle Charger. Jul 09, 2021 · 7. Discharge current. This is calculated by dividing the battery’s capacity . Add 2 hours to account for the absorption charging stage of most charge controllers: 3. Consequently, when trying to charge a larger battery at that rate, it will take a very long time and the battery may discharge at a greater rate than the 2-amp charge can provide. May 04, 2021 · Current rating or amp of the charger – the amount of current a charger is capable of delivering to a battery (2 amps, 6 amps, 10 amps, and so on) To determine charging time, multiply the battery capacity with the depth-of-discharge, then divide the product by the charger’s amp rating. Slow charging rates vary depending on the battery’s type and capacity. The higher the mAh rating, the longer the battery will provide power before needing a re-charge. That means in one hour the battery will receive a charge of 2 amperes and in 10 hours, it will receive a charge of 20 amperes and so on. Feb 02, 2021 · The question of whether to charge the battery at 2 or 10 amps basically focuses on the charge time because it is important to determine how long to charge a battery. Oct 19, 2020 · However, you don’t want the charging to take forever either. So a 2 amp charger will deliver 2 amp per hour to this “flat” battery, and if it requires 48 amps that in means it needs 24 hours to fully charge. Take the amount of amp-hours needed by the battery and divide it by 10 amps. For example, if you had a 50 amp-hour rated battery, you would to select a battery charger with a peak amperage rating of 3. I have been reading and I keep seeing articles that say 30 minutes to 2 hours for a full charge. com/channel/UC3uQslZWmE8XtVAIk-CoNyA/videosI common question. 8 volts to a maximum of 15. If you burn it for 2 hours it will consume 3 amp hours of battery power, etc. FWIW: 2003 Chevy 1500. Charging a regular car battery with a typical charge amp of around 4-8 amperes will take about 10-24 hours to charge it fully. " Historically, we used a value of 25-30% of a battery’s amp-hour rate as the maximum acceptance rate. This could reduce the battery’s service life in the long run. Jul 24, 2011 · Winter Park. It is sulfated. Here's how to use a portable deep cycle marine battery charger. You can charge a flat battery to 80 percent full in about 2 hours, so long as you alternator can manage produce around 14 volts at the battery terminals this whole time. Of course, connecting the battery to a lawn mower battery charger that has fewer amps may extend charging time. Feb 12, 2020 · The short answer is, in most cases, depending on the size of the battery, it will take around 5 – 8 hours to fully charge a 12-volt car battery with a solar panel that can produce 1 amp of current. Feb 03, 2016 · The same is true for battery chargers: Running one at high output for long periods of time will impact its life expectancy. For example, a 1C battery needs one hour at 100 A to load 100 Ah. A 10 amp charger can charge a 50% discharged small car battery (200-315 CCA or RC 40-60) in about 2 to 3 hours, a mid-sized battery (315-550 CCA or RC 60-85) in 3 to 4 hours, or a large car battery (550-1,000 CCA or RC 85-190) in 4 to 7 hours. Dec 05, 2010 · I have the charger set to 12 volts, 10 amps. Aug 01, 2020 · Q1. How long does a car battery need to be fully charged at 2 amps in general? Dominant battery chargers on the market nowadays deliver 2 amps per hour of electrical current to your battery. 15 = around 42 amp-hours back into the battery. Wait 15 minutes. So a battery that provides 48 amp hours will need 24 hours to be recharged at the rate of 2 amps per hour. Always before charging a battery in using the charger is best to refer to the manual that came with both the battery and the charger. This means that is supplies 26. So when you are charging a battery at 2 amps then it takes 24 hours for the battery to receive 48 amps of charge. However, there are other car battery charging solutions that offer up to 10 amperes. May 02, 2017 · A 2,500 mA charge on the same battery would be a 1C rate and would theoretically fully charge the battery in 1 hour (assuming 100% charge efficiency). Charging batteries slowly rather than quickly is recommended. The average time to charge your 48 amp battery is up to 24 hours. Since watts = amps * volts divide the watt hours by the voltage of the battery to get amp-hours of battery storage. Jul 06, 2021 · C-rate of the battery. Jan 26, 2021 · What this means is a fully-charged 12-volt car battery rated at 48 amp hours can deliver 1 amp for 48 hours or 2 amps for 24 hours. I have to replace them every season. At this rate, it typically takes over 24 hours to fully charge the battery. Typical charging rate, current and time for a standard 60Ah automotive AGM battery are 0. With a 1-amp charger it will take 10 hours. A battery trickle charger, also known as a slow charger, continually sends a small amount of current to the battery (usually 2 amps or more, depending on the charger). battery is about 2 years old. 7 volts. Models vary, but most offer a “jumpstart” or “quick charge” mode for a speedy car battery charge, as well as a lower power, long-term charge mode designed to safeguard batteries and keep them in top shape. It is Amps multiplied (x) by Hours. This is the current I used for either charging or discharging your . If possible, invest on a high-quality charger, which will provide a guarantee that the battery will be fully-charged without the need to wait for an extended period. 6. (Assuming the battery is dead or near-dead. g. 1. Going down this route, a car battery takes 24 hours to be fully charged at 48 amperes. Basically, at idle you can probably get 80 amps out of your alternator. 5C battery requires two hours. Charge your battery until it is up to 12. That keeps the voltage at 18 but doubles the amp hours to 5. May 28, 2019 · With two batteries in the boat, the owner would select a 2-bank battery charger. To charge a 12-volt lead acid battery (six cells) to a voltage limit of 2. Overcharging a battery causes excessive gassing — the electrolyte gets hot and both hydrogen and oxygen gas are generated. This also means the battery can supply 8 amps for 6 hours under ideal operating conditions. 8 amps in the duration of 5 hours without dropping off. Charge time varies based upon the "size" or amp output of the battery charger. how long to charge a battery at 2 amps