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Instead of trusting the cheap old charger that does not say what the percentage is it shows, why don't you measure the battery voltage?
The graph may be just as correct - lowering the amount of charge to the battery makes it less likely to burst in to flames, and allows it to charge faster - you simply set the constant voltage to a lower level. This is more likely if you're fast charging, and the lower terminal voltage obviously means the battery isn't as highly charged, and won't last as long - but at least your house didn't burn down. It's the sort of thing Samsung probably did, after their phones started catching fire.Maybe the cheap charger shows its guess of "percentage of charging time"?
We do not know if the cheap charger wrongly shuts off when the voltage reaches 4.2V when the graph posted by Nigel shows that then the battery is far from a full charge.
The battery university has a graph of discharge voltage that I disagree with. I found another discharge graph that looks correct:
how to measureInstead of trusting the cheap old charger that does not say what the percentage is it shows, why don't you measure the battery voltage?
WRONG.What voltage? i know the BM20 has 4.2v and the BP-5L has 3.7v
Not quite; they do not _discharge_ slower, they degrade slower in storage - eg. the battery loses far less total capacity when stored at around 50% than when fully charged.is true or myth that these BM20 2000mah 4.2v and BP-5L 3.7v 1800 batteries discharge slower with 30-50%??? i recharged them to 75% with this chinese charger