The main difference between NiCd and NiMh batteries is that NiMh does not suffer from the ‘memory’ problem as much as the NiCd version. This means they do not have to be deep discharged.|
1. Charge the battery when the performance of the tool diminishes. Do not try to drain the Ryobi BPL3626 battery.
2. Topping up and partial discharge is OK. Discharge till the tools starts slowing down once in 20 days or 30.
3. Can be kept in the charger to maintain charge if the manufacturer allows it. Check the instruction manual for this information. Many manufacturers make their chargers like this since Nickel based batteries lose their charge very fast.
4. Repeated full discharges are OK (till the point where the tool starts slowing down.) They don’t harm the battery. To deep discharge and recondition the Ryobi BPL3640D battery, take it out at this point and put aside for a day or two.
5. Check if your charger has a ‘reconditioning’ or a deep dis-charge mode. This is also know as a ‘maintenance cycle'. The better cordless tools have chargers with the ability to run the batteries through a maintenance mode.
6. Avoid charging in very hot locations. i.e. above 40°C.
Many manufacturers will recommend completely discharging your NiCd and NiMh batteries before storage. Not much point in storing them in a charged state either since they lose their charge pretty quickly.
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