| 01:08.21 | arossdotme-planb | i seam to have over discharged my laptop battery after leaving suspended for a day or 2 until it ran out of power. trisquel (ubuntu lts but with linux 4.* installed instead via a repo) looking at the /sys/class/power_supply/BAT0/ info. voltage file num is less than the num in voltage_min_design . i fear this means its been over discharged and so might not be able to charge? |
| 01:08.52 | arossdotme-planb | status says its charging though |
| 02:13.59 | DocScrutinizer05 | strange |
| 02:14.28 | DocScrutinizer05 | but yeah, suspend-to-ram is a mode pretty much designed to kill battery on most laptops |
| 02:15.45 | DocScrutinizer05 | I killed my ASUS OLPC(?) battery after only 2 months and ~3 charge cycles, with leaving it in suspend2ram |
| 02:19.24 | arossdotme-planb | asus netbook you mean? |
| 02:19.39 | arossdotme-planb | dam, i really hope i havnt |
| 02:19.58 | arossdotme-planb | well i have one pack left which is my bigger one at least |
| 02:20.42 | arossdotme-planb | i would have thought a hardware batt protection would have kicked in? |
| 02:21.17 | arossdotme-planb | well maybe/i guess i just have to acceptance the truth |
| 02:27.20 | DocScrutinizer05 | you'd think there *must* be a hw protection against deep discharge. seems it doesn't always work or even exist |
| 02:29.20 | DocScrutinizer05 | when the cells in battery pack are not properly balanced (both in production for properies and during battery management for discharge) I can see how discharging the pack can result in one cell getting deep discharged while the others till provide sufficient voltage so complete battery pack in within specks |
| 02:30.12 | DocScrutinizer05 | ~6*3.0 |
| 02:30.12 | infobot | 18 |
| 02:30.23 | DocScrutinizer05 | 5*4.0 |
| 02:30.26 | DocScrutinizer05 | ~5*4.0 |
| 02:30.26 | infobot | 20 |
| 02:30.51 | DocScrutinizer05 | see what I meant? |
| 02:31.44 | DocScrutinizer05 | while a cheap battery protection might kick in at 18 volt, already at 20V one of the cells might see reverse charging which for sure kills it |
| 02:45.14 | arossdotme-planb | arr ok |
| 02:46.10 | arossdotme-planb | would that mean one of the cells has become a ticking time one in that example you gave? the reversed charging/too low one |
| 02:46.18 | arossdotme-planb | ticking time bomb |
| 02:46.35 | arossdotme-planb | fire hazard, etc |
| 03:34.09 | DocScrutinizer05 | possible, yes |
| 03:34.36 | DocScrutinizer05 | though batteries usually explode only when you try to charge such dead cell |
| 03:35.30 | DocScrutinizer05 | and even then it's a rather rarely seen problem |
| 03:36.06 | DocScrutinizer05 | violent venting and heat however may happen |
| 03:37.36 | DocScrutinizer05 | real bombs only happen when some 'smartass' thought it's a nice idea to put a number of 18650s into a sealed waterproof housing made of airplane alu |
| 03:37.54 | DocScrutinizer05 | http://www.candlepowerforums.com/vb/showthread.php?262234-TK-Monster-Explosion |
| 03:40.42 | DocScrutinizer05 | >>I inspected the 8 green 18650 batteries that came with the light to check what kind of charge they were in. 4 of the batteries were at 100% and the other 4 had no charge. I charged the 4 batteries and came back to them shortly after to find them charged already. I carefully placed the batteries back into the light observing the polarity. << exactly the "unbalanced" case mentioned above that you *mist* avoid by all means. Also |
| 03:40.43 | DocScrutinizer05 | charging dead batteries here, then giving them massive discharge in a pack mixed with good cells |
| 03:41.47 | DocScrutinizer05 | >>and came back to them shortly after to find them charged already<< should have made that dude wonder |
| 03:43.08 | DocScrutinizer05 | defect or dead or even fake 18650, charge them for a short while, then expect "well, everything OK and easypeasy, no?" |
| 03:43.41 | DocScrutinizer05 | then operate a 100W(?) flashlight from them |
| 03:44.35 | DocScrutinizer05 | yeah, when cells vent in a sealed alu tube, that's pretty much what you call a pipe bomb |
| 04:52.34 | DocScrutinizer05 | (100W?) 250 actually |
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| 10:57.30 | arossdotme-planb | huh thanks for telling the story |
| 10:58.08 | arossdotme-planb | know of anyway to get cheep but good li-* 12v+ 12AH min packs from? |
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