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Jan 7, 2022 at 18:30 comment added rackandboneman @junkyardsparkle it tends to be even more drastic: OEM battery after 7 years: Tired but still serviceable. Cheap off-brand after 3 years: Often practically dead.
Jul 21, 2016 at 6:00 comment added Chris H @junkyardsparkle I have tended to buy a recognisable accessory brand (Hama perhaps) where possible, these appear to hit a sweet spot in price/performance. Some of the cheap ones have a much smaller new capacity, perhaps even made from sub-spec components rejected by the big brands.
Jul 20, 2016 at 22:10 comment added junkyardsparkle I actually did some methodical capacity testing on a bunch of batteries of the same type that I had accumulated over several generations of compact camera. Of the OEM batteries, even the oldest one (~7 years) still outperformed the best of my cheap ebay ones by a good margin... so apparently a quality battery can have a fairly long service life, variables aside.
Jul 20, 2016 at 20:40 comment added Itai That's a good point. There is no exact date when it's no longer good. It seems like a gradual degradation. I haven't noticed until recently because most times I change cameras, I got a new type of battery so replaced them all but now that I'm using a battery which has been unchanged for 4 generations, I feel it get's empty too fast. Although I have no initial measurement to back it up.
Jul 20, 2016 at 19:20 history answered Chris H CC BY-SA 3.0