Hi Arsenijs, > Am 14.11.2017 um 19:10 schrieb Pičugins Arsenijs <[email protected]>: > >> But are they safe for those batteries ? Did you try them? > > I have disassembled some of the "universal springy pins" chargers and they do > not seem safe, they don't seem to use specialised charging ICs and usually > use some kind of half-assed passives-based solution that ignores the CC/CV > cycle requirements for LiIon charging. They could be safe to use if you were > to throw out all the electronics and replace them with your own. > >> I half remember most smartphone batteries include a charger chip >> and GTA04 batteries do not (the chip is in the phone and should be >> in the charger). > > That is definitely not the case. 99.999% is that the "charger", that is, the > thing with a MicroUSB cable you plug into the wall socket, only provides > constant voltage and some guarantee about max current available (say, 5V/2A). > The phone has a charging chip inside, which takes 5V and uses it to charge > the battery, controlling the charging rate and stopping the charging process > when the battery is full. The battery itself doesn't have any provisions for > charging inside, aside from a protection circuit that prevents it from > overcharging (doesn't have to be there, but is included in 99.999999% phones > with LiIon batteries),
The GTA0x batteries we are considering here have such a protection inside. > and a thermistor so that the charger can measure temperature of the battery > and stop charging when the battery is too hot. Talking about protection > circuit, it protects from 1) discharging the battery too deep (because it > will get damaged, and in certain circumstances might burst into flames when > charged the next time), 2) overcharging the battery (even though the cha > rger is not supposed to do that, there's still a small chance, like charger > short-circuiting 5V onto its output because of a power surge) and 3) > short-circuiting the battery. Again, that is just how phones are built, at > least for a decade now. You were faster and more elaborate than I was :) BR, Nikolaus _______________________________________________ Community mailing list [email protected] http://lists.goldelico.com/mailman/listinfo.cgi/community http://www.tinkerphones.org
