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| 16:40.22 | DocScrutinizer05 | >>shutting discharge off and allowing recharge<< is exactly what PROT is supposed to do when reaching end-of-discharge cell voltage |
| 16:42.16 | DocScrutinizer05 | POTection chips have a end-of-discharge and a cell-dead threshold, they stop discharge at the first and "kill" battery completely at the second |
| 16:42.29 | DocScrutinizer05 | PROTection even |
| 16:43.38 | DocScrutinizer05 | end-of-discharge is often between 2.5 and 3V or somesuch, cell-dead is a maybe 0.5V lower than that |
| 16:44.15 | DocScrutinizer05 | so cell would have to self-discharge a 0.5V to reach cell-dead state |
| 16:44.37 | DocScrutinizer05 | there's no other way to discharge it beyond end-of-discharge |
| 16:45.50 | DocScrutinizer05 | the üroblem is that device like jawbone etc might not have _any_ proper PROT circuitry, relying on software solely for battery management |
| 16:47.03 | DocScrutinizer05 | if they already don't have PROT, they likely also have no means to emergency-charge battery once it's too low to power up the CPU which does all the battery management |
| 16:47.47 | DocScrutinizer05 | pathetic EE design |
| 17:28.05 | juri_ | don't care; saved 5 cents! |
| 17:30.25 | DocScrutinizer05 | exactly |
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| 18:49.08 | Stormwind_mobile | I have no knowledge of the reasoning or design decisions, just observed this time and time again. Batteries were way above 0,5V, for sure. |
| 18:50.28 | Stormwind_mobile | On the other hand, I had more than one dead laptop battery, where one of the cells shorted, killing the 1-2 cells in parralel with it. One battery had a set of three parallel cells that all failed open. Really strange. |
| 18:51.18 | Stormwind_mobile | Those were all cylindrical cells with steel shells and elaborate battery protection systems ("smart batteries") |
| 19:52.54 | DocScrutinizer05 | Stormwind_mobile: please don't get my statements wrong. Battery_Dead cutout is some 2V, a cell at 0.5V is dead like a carbide stone. The *DIFFERENCE* between discharge-stop and kill-battery-for-good is maybe 0.5V, from 2.5V down to 2.0V |
| 20:12.39 | DocScrutinizer05 | Stormwind_mobile: https://i.imgur.com/B3ANok7.png from www.ti.com/lit/gpn/bq2973 |
