AGM Battery Charging
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To maximize the life of your Chrome Battery brand battery, it is important that it is properly charged. As with all lead-acid batteries, both over- and under-charging a Chrome Battery AGM battery will result in shortened service life. The best protection from improper charging is the use of a quality charger and routinely checking that the charger current and voltage settings are maintained. Please read the following instructions before using your battery. Charger Inspection The charger cabling should be insulated and free of breaks or cuts. The cable connectors should be clean and properly mate with the battery terminals to ensure a snug connection. The chargerâs AC cord should be free of breaks or cuts and the wall plug should be clean. Charging Guidelines
- Fully charge batteries after each use.
- Charge in a ventilated area as gasses may be released through the pressure relief valve if the
batteries are excessively over-charged.
- Never charge a frozen battery.
- Ideal charging temperatures: 32Â°F â 104Â°F (0Â°C â 40Â°C).
- Charging Characteristics If the charger has a setting for AGM, use this setting to charge your Chrome Battery AGM battery. To maximize your battery life a voltage regulated charger with temperature compensation is strongly recommended.
- The initial charge current is recommended to be set at I1= 0.25 X C20Â (Imax= 0.35 X C20) in order to fully charge the batteries within a reasonable amount of time. Â It can be set lower, however please be aware that charge time will increase so make sure the batteries have enough time to fully charge before being put back into service. Chrome Battery AGM batteries have a low internal resistance allowing them to be charged at a higher current, therefore faster, than conventional flooded/wet batteries. Bulk stageÂ - the charger should deliver the initial current I1Â until the voltage limit U0Â is reached. Â Absorption stageÂ - the charger should maintain the voltage U0Â until the current tapers to I2. Â Float stage and terminationÂ â the charger can maintain the current I1Â indefinitely or until the charger is shut off or unplugged. Â This stage is ideal to maintain battery state of charge. Make sure the temperature compensation is programmed as specified in the graph above (-4mV/Â°C/cell or -2mV/Â°F/cell) or manually adjust the voltage setting for temperatures varying from 25Â°C (77Â°F). Â As the temperature decreases, the voltage should be increased and as the temperature increases the voltage should be decreased. The profile in this graph can be used with or without the float stage. Â Without the float stage, rechargeÂ can be terminated based on time (this will need to be determined as it will vary with depth of discharge and charge current) or percentage recharge (~105%-110%).
- excessive over-charge. Â See figure below for the recommended constant current charge profile. Bulk stage -Â the charger should deliver the initial current I1Â until the voltage limit U0Â is reached. Absorption stageÂ - the charger should maintain the voltage U until the current tapers to I2. Termination -Â If the charger can be programmed, the charge should terminate when the voltage stops increasing over time. This is called a dV/dT termination. The charge should terminate when the dV/dT is equal to 2.5mV/cell/hour. The charge time in the final phase should not exceed 8 hours and the total charge time should not exceed 20 hours. The percentage recharge should be between 105%-110%.
- Charge Voltage Quick Reference Â