I recently opened a pack of NiMH AAs that I'd had lying around for a while, & some of them wouldn't charge at all. I tried putting them in the fancy German charger as well (I can't remember the model name, but it's the one that has discharge, test, & refresh modes) but it just showed "null" for them, as if they weren't even there.
Is there some need to charge NiMH cells as soon as you buy them?
No, but NiMH do die even if unused. In my experience it takes 2-4 years for this to happen.
Also some Chinese manufacturers produce cells that never work. The brand "BTY" is a standout in this category (BTY = "battery thought you - ha ha")
No, but NiMH do die even if unused. In my experience it takes 2-4 years for this to happen.
Also some Chinese manufacturers produce cells that never work. The brand "BTY" is a standout in this category (BTY = "battery thought you - ha ha")
***Eneloop rechargeable NiMH batteries by Sanyo are very good at retaining their charge. Have had some still almost fully charged after a year, while other brands are dead in 2 or 3 months.
I really like Eneloops. They are not available with solder tabs, so I bought myself a spot welder so that I can make all my batteries from Eneloops. I wish they were available in Sub-C size.
From what I understand, Panasonic have now bought Eneloop.
Other brands also have LSD (Low Self-Discharge) batteries.
The OP was asking about dead as in faulty batteries that could no longer take a charge
Right: they've never been charged (I just opened the package) & they are "pre-dead".
These were Maplin's own brand --- first time I've had a problem with them, but you never know if they're all coming from the same place.
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