having had a lead acid that caused my entire car to fail while driving, i can see this being very popular.
Re:
New battery technology
hen918, Sun Aug 30 2015, 11:42AM
Conundrum wrote ...
having had a lead acid that caused my entire car to fail while driving...
-A
How on earth did your battery do that? Internal short?
EDIT: after looking at the link, I would suggest that these batteries could cause more problems than they solve. If the electronics fail, lots of nasty things could happen.
I Have 8 of the LiFePO4 cells pictured in the link and 4 of them have died due to the balancing / protection circuitry failing and slowly discharging the cells to 0v
Re:
New battery technology
Conundrum, Sun Aug 30 2015, 02:49PM
hen918 wrote ...
Conundrum wrote ...
having had a lead acid that caused my entire car to fail while driving...
-A
How on earth did your battery do that? Internal short?
To replier: Yeah, that did it. BIG blister on the back of the affected cell close to the clamp, fortunately it didn't melt through the case.
EDIT: after looking at the link, I would suggest that these batteries could cause more problems than they solve. If the electronics fail, lots of nasty things could happen.
I Have 8 of the LiFePO4 cells pictured in the link and 4 of them have died due to the balancing / protection circuitry failing and slowly discharging the cells to 0v
Yeah, same experiences here. (cheap controller, nuff said).
More e-bike packs fail due to the $9 controller failing in creative ways than from bad cells.
I think however that given the good track record of LiFePO4 the chances of a fire caused by these are lower than even from a lead acid.
Not many car batteries include internal fuses and overheat/etc protection.
I do think they should add warnings about not jump starting other vehicles except using safe procedure as the load from doing so might be too much.
Also to OP: do you still have them?
I've managed to recover 80% of my "totally deader than dead" LiFePO4 from DX, with a few clever tricks: for those curious PM me.
Only one permanently failed and that was due to an external SNAFU which made the cell bulge up and the failsafe tearaway correctly opened isolating the cell in that case.
Four of mine were overdischarged twice (never learn!!) and recovery procedure did the trick although they didn't work particularly well probably due to copper shunts.
With low capacity cells procedures that would be incredibly dangerous on 3.3Ah screamers (tm) seem to work although there is always a capacity penalty.
Such cells with care still have value for solar power apps if buried in dry sand well away from anything flammable just in case.
Also worth noting, I have unpatented procedures for scanning of "bad" cells of differing types that can identify which are likely to come back and which should be disposed of safely.
Typically about 60% of "bad" cells fall into the recoverable category but if they have dwelled at below 0.9V (LiFePO4) or 1.3V (LiNiMnX) if >1.5 Ah they are totally unrecoverable.
Also see
(note about runaway cells!)