[Tinkerphones] New tinkerphone gadgets in Goldelico shop?
j1441 at vfemail.net
Tue Nov 14 19:12:39 CET 2017
let the adventure begin!
On November 14, 2017 11:10:12 AM MST, "Pičugins Arsenijs" <crimier at yandex.ru> 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.
>Community mailing list
>Community at tinkerphones.org
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