A smaller appropriate charger is a better choice. You could add a 2.5A constant current source. You could modify the circuitry. Recommended charging for lead acid batteries - Battery University Chargetek’s charging and equalization - additional information By clicking “Post Your Answer”, you agree to our and acknowledge you have read our .
If at all possible, operate at moderate temperature and avoid deep discharges; charge as often as you can (See BU-403: Charging Lead Acid) The primary reason for the relatively short cycle life of a lead acid battery is depletion of the active material.
Make certain that the battery does not “boil” or heat up during charge. Put an eye on the battery when charging above the manufacturer’s recommended C-rate. Watering is the single most important step in maintaining a flooded lead acid battery; a requirement that is all too often neglected.
Under the right temperature and with sufficient charge current, lead acid provides high charge efficiently. The exception is charging at 40°C (104°F) and low current, as Figure 4 demonstrates. In respect of high efficiency, lead acid shares this fine attribute with Li-ion that is closer to 99%.
The primary reason for the relatively short cycle life of a lead acid battery is depletion of the active material. According to the 2010 BCI Failure Modes Study, plate/grid-related breakdown has increased from 30 percent 5 years ago to 39 percent today.
The best way to get rid of unwanted lead-acid batteries is to ask a professional to take them away. This recycling option is also quite profitable and you can send your batteries to BatteryClerk for easy disposal.