Made by various manufacturers and sold as "Eneloop" "Ready-2-use" "ReCyCo" they are available in AA, AAA and PP3 (9V) and are little more expensive than the older type.
Forget the old rules about looking after NiCd batteries, they don't apply to NiMH batteries. Most important things to remember for NiMH cells are:
- DONT charge them in NiCD chargers - they cant tell when they are fully charged. However you can charge NiCd in most NiMH chargers.
- DONT let them become completely flat - NiMH cells need reconditioning after a deep discharge, and may never fully recover.
- DONT store them when discharged and remember even if not used they will need recharging every 6 months or so (2 years for the LSD types).
- DONT draw excessive current. NiMH batteries degrade rapidly if asked to supply current at more than half their capacity per hour (i.e. 1A for a 2Ah cell)
Store both Li-Ion rechargeables and NiMH batteries in a cool place (the fridge - not the freezer) to reduce self-discharge.