Aging of NiMH Cells (2 Years of Storage)
I’ve got some leftover cells from tests I conducted 2 years ago. I thought I could test them and compare them with their earlier results.
So here we go…
Test Objects and Results (Ongoing)
Fujitsu Black - no change
TRONIC eco 2400 - higher IR
VARTA 2600 - lower capacity, higher IR
Vapex Instant 950 - no change
enelong 900 - lower capacity
everActive ProfessionalLine 1000 - lower capacity, higher IR
Polarcell 1150 - lower capacity
Camelion Ni-MH 1000 - lower capacity
Camelion Ni-MH 1100 - lower capacity
ActivEnergy 900 ReadyToUse - lower capacity
PKCell 1200 - lower capacity
TRONIC eco 900 - higher IR
Some better cells (made in Japan) don’t age that much. Other tend to loose capacity or develop higher internal resistance or both.
If you need to buy NiMH cells for storage then go with the Japanese ones. Otherwise it is better to wait until you need them and buy them fresh anew from reputable sources.