- Re: Hot Batteries in TV Remote
- 12-12-2008
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On Dec 11, 3:46 pm, dpl...@radagast.org (Dave Platt) wrote:
that the springs on the negative battery terminals had been compressed
over the years and the batteries were not snug in the compartment.
How about the battery was loosely set in the battery drawer AND the
remote was wedged between the sofa cushions constantly pressing down
on some buttons. It's been like that overnight. Then my son comes
along, pulls the remote out from the cushions and notices it is hot.
(?)
I'll ask him if the remote was wedged in the sofa when he gets home
from school.
that the springs on the negative battery terminals had been compressed
over the years and the batteries were not snug in the compartment.
How about the battery was loosely set in the battery drawer AND the
remote was wedged between the sofa cushions constantly pressing down
on some buttons. It's been like that overnight. Then my son comes
along, pulls the remote out from the cushions and notices it is hot.
(?)
I'll ask him if the remote was wedged in the sofa when he gets home
from school.
- Re: Hot Batteries in TV Remote
- December 11, 2008, 4:33 pm
- Re: Hot Batteries in TV Remote
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> local site-of-generation of the heat which started to melt the
> plastic. However, I think it's a secondary issue, and not the only
> source of heat generation - the internal resistance of the batteries
> would also have been a generator.
> The real question is, why was so much current being drawn from the
> batteries (and released as heat)? A remote control, when working
> properly, is a relatively low-current device (a few tens of
> milliamperes, I imagine) with a relatively low duty transmission duty
> cycle, and it shouldn't be drawing more than an infinitesimal amount
> of power from the batteries when there's no button being pushed.
> I think there might be several reasons why this overheating might have
> occurred:
> - Batteries inserted backwards, in a remote which has a reverse-biased
> across-the-battery diode at the input to its electronics. The
> diode could act as an effective short-circuit across the batteries
> if they were inserted backwards. [Using such a diode, and not
> having a fuse or a resettable thermal current limiter in series
> with the battery, would seem like a Really Bad Idea.]
> - Some bit of metal came loose inside the case (maybe a loose
> connector, maybe a stray bit of wire) and short-circuited the
> battery connections. Or, possibly, some conductive liquid (salty
> broth?) was spilled onto/into the remote, and resulted in a near
> short circuit.
> - A cat sat on the remote, it started transmitting continuously, and
> (due to bad design or some sort of internal circuit fault) it drew so
> much current that it overheated.
> I tend to lean towards the second possibility, myself.