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There are a number of smart chargers on the market. I have a technoline/lacrosse BL 700 that does "refresh" on batteries, and it did indeed seriously revive some old AA's i have. It works by repeated charging and discharging the cells until they show a stable capacity. It can take several days to do this, so if you have a lot of batteries you definitely want a charger that takes 8 or more at a time.
The most useful feature is that after the refresh the charger tells you the cell capacity, which gives you a good idea of how bad a state it is in, and helps with matching up sets.
One thing though - if you get a smart charger, keep your old dumb one too. If cells become too discharged and can't give a voltage, the smart chargers won't charge them. 5 mins on a dumb charger then gives enough charge for the smart charger to recognise them.
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