let the adventure begin! On November 14, 2017 11:10:12 AM MST, "Pičugins Arsenijs" <[email protected]> wrote: >> 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), 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. > >-Arsenijs >_______________________________________________ >Community mailing list >[email protected] >http://lists.goldelico.com/mailman/listinfo.cgi/community >http://www.tinkerphones.org
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