Lead Acid Battery Charging Procedures
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Charging Voltages
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Lead acid batteries should be charged often. It is not necessary to completely discharge them before replenishing power. If the battery is being stored and not actively used, a maintenance charge can be used to prevent the battery from degrading.
Current higher than 2.15 volts will begin to replenish the stored power. Usually, higher voltage is used in order charge the battery faster. Voltage should not exceed 14 volts, however, as voltages beyond this limit may cause damage to the battery cells.
Unregulated Charging
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Always use chargers designed specifically for use with lead acid batteries. There are two general types of chargers: unregulated and regulated.
To use an unregulated charger, connect the wall transformer to an AC outlet. This transformer will deliver charging voltage continuously. Connect the charging connections to the positive and negative poles of the battery, as marked, and the battery will begin to charge.
Unregulated chargers cannot be used to maintain a battery, and must be completely disconnected once the charge is complete. Allow the battery to charge overnight, then remove the charger. -
Regulated Charging
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Regulated chargers use circuitry to constantly monitor the battery, and adjust voltage and current as needed. Because of this circuitry, the battery can be left connected--the charger will maintain the correct charge.
Use a regulated charger by connecting the wall transformer to AC power. Negative and positive poles on the battery should be connect as marked on the charger. Once the battery is connected, a charging circuit will perform a test and begin charging at the proper level. There is not need to disconnect the battery once it is charged.
Be aware that many chargers, especially if left connected for long periods of time, can become very hot. Place the battery and charger in a safe location that will not be effected by heat or possible battery leakage.
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References
- Photo Credit Justin Wick
