> is it an genuine (really in strict sense of the term) brand battery or a > compatible replacement (even if they call it "genuine", always puzzles me). > Since I keep alive a lot of vintage laptops and am the author of > GNUstep's BatteryMonitor I share the experience that non-original > battery can have their controllers do the wildest things. Usually > sourced from China they have compatible controllers (well, I can imagine > producing hundreds of different models, they must have compatible > emulating chips). It’s the one that came with my Framework laptop new from factory. I don’t know how cheap they are, I guess framework tries to include good components.
> > I have seen incorrect cycle count. Sometimes I think they just miss to > calculate partial cycles... so if you never do full cycles, the battery > appears new. Otherwise it is just buggy or explainable for me. To be honest I never actually verified the cycle count before. I have just recently been letting it go to full exhaustion, I almost never let it “die” so that may have something to do with it. I’ll keep an eye on it. > > Some batteries skimp on the design vs. last capacity too. Most often I > have seen them to be about the same value forever. Or a too high design > value is tricked and if you open the cell it is not corresponding. This one has degraded quite a bit so I’m thinking it’s being honest with me. I’ve been through quite a few cycles with it because I assumed the system wasnt doing any DC pass through. One interesting thing with this battery that I’ve just noticed is that the bios has an option to limit charge to a given percentage. If I limit the charge to something, say 60%, and monitor the current when it gets to 60%, it goes to perfect zero. The only way the current will go up is if I do a very heavy CPU load. For this reason, I’m not sure it’s doing straight pass through — it must be some kind of hybrid design or something I don’t understand. If I leave it at the default 100% setting for a full charge, when I get to 100% it still runs about 2.2W idle in OpenBSD (1.6W in Linux), so the way the battery or system firmware works for 100% seems to be much different than for 60%. Maybe it’s just because of the voltage difference between the two maxes. I haven’t tested 99%, for example.
