Beware the crappy chargers. Repeated use will reduce the capacity of your batteries, and using the cheap charger even ONCE may be enough.
I record the date of every time I charge my batteries because I'm a bit crazy like that.
I have some first-gen eneloops (bought the batteries, plus a Maha MH-C9000 smart charger in 2009, the batteries also came with cheap chargers) and here's the charge cycles of a typical AAA (used exclusively in TV/stereo remote controls) since new:
Charge 1, 2009/12/17
Refresh cycle on MH-C9000
Reported capacity after charge: 761 mAh
Charge 2, 2010/01/02
Refresh cycle on MH-C9000
Reported capacity after charge: 795 mAh
Charge 3, 2010/05/01
Charged on Cheapo Charger
Reported capacity after charge: N/A
Charge 4, 2010/11/16
Refresh cycle on MH-C9000
Reported capacity after charge: 833 mAh
Charge 5, 2011/05/23
Charged on Cheapo Charger
Reported capacity after charge: N/A
Charge 6, 2011/11/16
Charged on Cheapo Charger
Reported capacity after charge: N/A
Charge 7, 2012/04/14
Charged on Cheapo Charger
Reported capacity after charge: N/A
Charge 8, 2012/11/07
Refresh cycle on MH-C9000
Reported capacity after charge: 693 mAh
Almost all of my batteries are showing about 100 mAh capacity drop after three charge cycles in a row on a cheap charger. One use of the cheap charger didn't seem to affect the AAAs.
But the AAs showed reduced capacity after just ONE charge cycle on the cheap charger.
Avoid the cheap chargers like the plague. A good charger is worth every bit it costs.
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