I had a Twister Medevac battery which had puffed up and was no longer any good so we split it into two separate cells and started overcharging them. The first cell was slightly puffed but it is difficult to see in the first shot. By the fourth shot though you can see it really stressing.
It's nearly at bursting point here:
Then finally it can't take any more:
When it was time to do the second cell we thought we'd put a fire cracker under it for a bit of extra effect:
Almost there .....
And ignition .....
Then finally the fire cracker went off:
Wed Nov 07, 2007 7:04 pm
zx12r
Joined: 19 Mar 2007
Posts: 55
Lovely
I have an ewatts 6's 4400 that i no longer have any respect for
do you want it for your next trick ?
this was all for photographic purpose's wasnt it ?
for education
Wed Nov 07, 2007 8:24 pm
Fish_in_a_Barrel
Joined: 30 Sep 2006
Posts: 673
Location: Perth, Western Australia
I suppose you weren't measuring, but do you know how much they were overcharged? _________________ They say that he crossed the fine line, from insanity to genius.
Wed Nov 07, 2007 10:18 pm
Stephen
Joined: 20 Mar 2007
Posts: 14
Location: Melbourne
quote:Originally posted by zx12r:
Lovely
I have an ewatts 6's 4400 that i no longer have any respect for
do you want it for your next trick ?
this was all for photographic purpose's wasnt it ?
for education
That would be good Mark. I'm sure the higher capacity battery would burn for longer.
quote:Originally posted by BH Mike:
I suppose you weren't measuring, but do you know how much they were overcharged?
I don't really know how much charge was in the cells initially but the power supply we were using could deliver about 32v maximum at up to 3A. When you first connect the cells up the power supply current limits to 3A so it would only hold about 5v but as time goes on this slowly climbs. When the cell reaches around 6 or 7 volts they start to runaway and the voltage climbs right up. The first cell we did (which was puffed to start with) only got to about 10v before it was in flames but the second one climbed all the way to 32v and sat at that voltage for about 10 or 15 seconds before flaming up big time. The second one definitely went up much better than the first one, even before the fire cracker detonated.
Thu Nov 08, 2007 11:06 am
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