don't leave batteries on charge at home unattended!

[calumco]

can't actually believe it, im actually feeling pretty lucky right now.

bin sorting out my robot all day in my shed so in my room i left its batteries on charge, comming back to check up on them every now and again.

just looked now and i really don't know why but both nimh packs have melted and leaked on my desk :S im actually lucky they didnt end up catching fire or something.

i wont be doing that again!

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[RogueTwoRobots]

Re: don't leave batteries on charge at home unattended!

Was that on trickle charge?

I've got the same packs (Vapextech with the newer red cell coverings) and quite often trickle charge them overnight. Don't fancy the idea of my room possibly going on fire, especially considering I almost did it to myself today.

Any known damage within the pack/cells? Could possibly be a reason for them overheating like that if they were on a trickle.

[calumco]

Re: don't leave batteries on charge at home unattended!

no, as far as i no they were fine and they were ok when i did them yesterday aswell, and i was giving them a real nice slow charge and discharge, nothing that i wudda thought wud cause that to happen lol

and from a closer look, both packs were next to each other at the time and i think the pack with only slight melting on it has just melted from the heat of the other more melted pack which was sat right next to it. so i think one may still be ok

[JamesDavies]

Re: don't leave batteries on charge at home unattended!

wouldn't have mentioned it on here otherwise, but yesterday i was charging the batteries in Leveller (24v lead acid) with a new charger. I left it going in the shed and went in for a few hours expecting it to cut out when it was done. I came back later to find one of the batteries had blown off it's cover and 4 of the little rubber caps (over the holes for topping up the water) and the water was bubbling and coming over the top with a nice little puddle over lev and the floor. The charger still convinced it wasn't fully charged...

Any ideas what the hell happened?? :s

[psycho_fling]

Re: don't leave batteries on charge at home unattended!

what charger were you using???

[JamesDavies]

Re: don't leave batteries on charge at home unattended!

Me? We got it off Terry but only just used it... Its- umm, I'll try and get a pic

[JamesDavies]

Re: don't leave batteries on charge at home unattended!

this is it...

[typhoon_driver]

Re: don't leave batteries on charge at home unattended!

looks like a wheelchair battery charger if im not mistaken?

[JamesDavies]

Re: don't leave batteries on charge at home unattended!

yup, thats right Gary

[swanaldo]

Re: don't leave batteries on charge at home unattended!

Yes Gary thats right.

[leorcc]

Re: don't leave batteries on charge at home unattended!

I've used one exactly like that for years with Splinter and now Mantis. Not the best charger in the world but they get the job done usually. I am very surprised that happened with it James.

[JamesDavies]

Re: don't leave batteries on charge at home unattended!

It was a bit odd... Any idea why it might happen/ how we might rectifuy it?

[leorcc]

Re: don't leave batteries on charge at home unattended!

I honestly have no idea.

[Laser]

Re: don't leave batteries on charge at home unattended!

http://www.youtube.com/watch?v=tuoZB8Y3IOg&NR=1
This is what happens if you overcharge your LiPo

[PJ-27]

Re: don't leave batteries on charge at home unattended!

Don't breathe this.....