Typically I fully charge the batteries.
Very odd. I just checked this with two LP-E17 batteries that I have in a drawer, one quite old, using a friend’s camera (as I no longer have a suitable body). They haven’t been charged in over 2 years but both still showing about 2/3 capacity and 3 green recharge performance bars.
These batteries do have a manufacturing year dmembossed on the label which might help you decide which is which. I label mine with date of acquisition. The discussion has been mostly about the “recharge performance” (green/red bars seen in the battery info tab), rather than about battery life, which obviously varies considerably with how they are used. It would be useful to know what these bars actually mean, because they seem to have little correlation to battery life or even longevity.
I bought a pair of batteries about 5 months apart in 2020.
I didn't drain them completely before recharging.
The batteries show 100% in the camera but show red for recharge performance.
I have no idea. I don't use my camera much anymore for any events, etc. but more for pleasure. I do plan on a 2-3 week trip to Europe next year so will probably buy 2 more just for precautionary measures but won't buy them until closer to the trip. I'll continue to use these until they die completely.
After I charge these batteries I take them out of the charger typically in less than an hour.
Never fully charge lithium ion batteries (whether those in phone, strobe or camera), every time you did that, you are reducing the lifespan by a tiny bit. You can watch wes perry video on that. He was talking about Godox battery for the flashes, but the same principle applies
I have done the same thing with numbering batteries for years. That way I'm not hammering the same battery over and over with recharges. I'm not sure if it really helps but I have batteries from my Nikon cameras that are 8-10 years old and still charge and work. I've only been in the Canon system for about 18 months so it's too early to tell but so far, none of my batteries are showing any trouble.
Right, for clarification, I meant when I'm picking up a battery to put in my camera I don't have it easily marked which battery is the oldest.
Thanks, interesting.
+1 A Li-Ion battery will basically last an unlimited number of charging cycles if you only charged it up to 40% every time (and discharged it down to 20%).
When these batteries have completed a charge cycle they are still not fully charged and sit below the 4.2v that could be considered the ceiling (per cell).
Just measured a Canon, fairly new, 3 weeks old. Popped it back on the charger, waited a minute and removed.
