Just opened a new pack of old stock 2008 vitange eneloop. Still had a full charge
I was cleaning things out and I found a set of charger/4 AA combo I bought a long time ago and forgot about. They're Sony branded pre-charged. Made in Japan 2,000mAh 1,000 cycle rated. I think they're rebranded eneloop. The date code is 2008. I discharged them at 500mA. They all delivered 1,300-1,350 mAh and held a stady 1.15 to 1.20v during the bulk of discharge cycle. After six years. Right out of the package!
From what I gathered in threads here, they are shipped pre-charged, but not completely full.
Charged them back up with an eneloop charger. After my first charge, I discharged them at 1,000mA. I got 1900 to 1950mAh from every one of them. I chose 1A just to cut the time.
I also have two made in 2006. They put out voltage but they are so deteriorated that every charger rejects them and I can only charge in a timer charger. They were all kept loose and not in a device so they didn't get drained to the ground. I wonder if the first use initiates a permanent internal structure that gets the clock ticking on deterioration in storage or if the key is to store them half charged. Are they equally shelf stable if If I cycle them a few times and store them again at half charge?
NiMH was in the most competitive phase in those days. I remember getting NiMH bundled with a Sony charger that got rejected by the charger right out of the package and it was a current model back then.
I was cleaning things out and I found a set of charger/4 AA combo I bought a long time ago and forgot about. They're Sony branded pre-charged. Made in Japan 2,000mAh 1,000 cycle rated. I think they're rebranded eneloop. The date code is 2008. I discharged them at 500mA. They all delivered 1,300-1,350 mAh and held a stady 1.15 to 1.20v during the bulk of discharge cycle. After six years. Right out of the package!
From what I gathered in threads here, they are shipped pre-charged, but not completely full.
Charged them back up with an eneloop charger. After my first charge, I discharged them at 1,000mA. I got 1900 to 1950mAh from every one of them. I chose 1A just to cut the time.
I also have two made in 2006. They put out voltage but they are so deteriorated that every charger rejects them and I can only charge in a timer charger. They were all kept loose and not in a device so they didn't get drained to the ground. I wonder if the first use initiates a permanent internal structure that gets the clock ticking on deterioration in storage or if the key is to store them half charged. Are they equally shelf stable if If I cycle them a few times and store them again at half charge?
NiMH was in the most competitive phase in those days. I remember getting NiMH bundled with a Sony charger that got rejected by the charger right out of the package and it was a current model back then.
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