Hi, I bought one of these chargers the other year; it only charges AA and AAA's but it would be great to build something better that did a full range of battery types.
http://eu.nkon.nl/maha-powerex-sanyo-eneloop-chargers/maha-c9000-eneloop.htmlHere are the chargers feature list :-
1) Charge
This charger can charge with a charge current between 0,1 and 2A (thus 100 and 2000 ma). Fast charge can be handy, but slower is better for batteries.
2) Refresh and analyze.
Batteries will be charged, discharged and charged. This keeps batteries in good condition.
3) Break in ( IEC capacity analysis )
This option can be used to revive old batteries. Also the capacity is given at the end of the process according the IEC norm.
4) Discharge
The charger can discharge batteries with a current between 100 and 1000 mA
5) Cycle
This mode chargers and discharge a battery up to 12 times. Can be used to get old batteries in good condition.