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How To Charge A Deep Cycle Battery

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Many applications require deep cycle batteries, electric vehicles need starting batteries, home energy storage needs energy storage batteries, robots need batteries for power, and so on. It is very important to use it correctly while taking the necessary maintenance. Wondering how to charge a deep cycle battery the right way? You have come to the right place!

What Is A Deep Cycle Batery? How To Choice The Right One?

General deep cycle batteries are divided into power deep cycle batteries with start-up function, and ordinary deep cycle batteries for power supply.

The purpose of the starter battery is to provide a brief high current pulse to activate the starter of the outboard, so the purpose of the starter battery is achieved. Once the outboard is running, its alternator will charge the starter battery to compensate for the power provided by the starter motor, as well as draw power for other “house” needs, including live wells or bilge pumps, fishfinders, or navigation lamp.

The rest of the power system is best powered by regular deep cycle batteries designed to provide low to moderate continuous current for extended periods of time. Our ELB deep cycle batteries generally have a cycle life of 2000~4000 cycles. Enter the ELB battery center to choose the deep cycle lithium battery that suits you.

How To Charge A Deep Cycle Batery?

Choice The Right Battery Charger

Without a doubt, the best charger for deep cycle batteries is the original Lithium battery charger. After you upgrade the lead-acid battery to lithium battery, please do not continue to use the lead-acid battery to charge the lithium battery.

The wrong charger can damage your battery, or at the very least, you’ll see an error code and your battery won’t charge.

At the same time, the right charger will help you charge the battery faster. Lithium-ion batteries, for example, can handle higher currents. They charge much faster than other types, but only when paired with the right charger.

So how to choose the right charger? In short, read the instructions for the charger. It will specify the type of battery you can use to charge it. For lithium deep cycle batteries, select the appropriate LiFePO4 dedicated battery charger. They charge at a steady rate, and they stop charging when the battery reaches full voltage.

Choice The Right Charge Voltage And Current

The battery is usually marked with the maximum continuous charging current and the charge cut-off voltage, find a charger with the voltage and current that matches your deep cycle battery, for example, a 12V charger is compatible with a 12V battery.

To choose the right amount of amps, check the battery’s maximum continuous charge current, which will be noted on the battery manual. Generally speaking, the amp rating for charging is no higher than the amp hour rating of the battery.

Charge The Battery Under Suitable Conditions

Typical lithium deep cycle battery charge and discharge temperatures are between -4°F – 131°F (0°C – 55°C).

If the temperature is too high or too low, the working efficiency of the battery will be affected. When the temperature is higher than the over-temperature protection value of the BMS, the BMS of the lithium battery will start the battery protection function and stop charging.

If you need to charge and discharge at extremely low temperature, please choose our low temperature battery or heated battery. The charging and discharging temperature can reach -20°C, but still work and charge normally. For batteries in special conditions, please check our specialty batteries.

Battery Charging steps

  1. Make sure the battery terminals are clean.
  2. First, connect the red (positive) cable to the red terminal. Then connect the black (negative) cable to the black terminal.
  3. Plug in the charger. Open it.
  4. If you use a smart charger, you can “set it and forget it”. It will stop charging on its own. 5. Our lithium battery has overcurrent and overvoltage protection functions, when the battery is fully charged, the charger will automatically disconnect. But most lead-acid chargers require setting a timer and disconnecting the charger while the battery is charging.
  5. To disconnect, please unplug the charger. Remove the black cable, then remove the red cable.

Why We Need To Charge Deep Cycle Battery Correctly?

The correct way to charge the battery affects the life and duration of the battery. For lead-acid batteries, overcharging will destroy them. The lithium battery has multiple protection functions of BMS and will not be damaged, but long-term continuous wrong charging will also affect the life and capacity of the battery.

How Long To Charge A Deep Cycle Battery?

The time required to charge a deep cycle battery system depends on the capacity of the battery required and the amperage the charger can deliver.

Generally speaking, the smaller the capacity, the faster it is fill. The larger the charge and discharge current, the faster it will be fully charged. The following is the approximate charging algorithm between batteries,

Charging time = battery capacity / charging current of the charger

For example, if we charge a 12V100Ah battery with a 12V20A charger, the charging time is 100Ah/20A=5hours around. And if we use a 48A charger, then we only need 100Ah/48A=2.1hours around.

In any case, depending on your own usage, choosing the right charger can speed up the charging time.

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