nuckolls.bob(at)cox.net
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 Posted: Mon Nov 26, 2007 7:15 am Post subject: Black and Decker VPX 7V LiIon Batteries |
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At 04:30 AM 11/26/2007 +0000, you wrote:
| Quote: |
Hi Bob
"Yeah, found those at Wally-World a few hours ago myself. Home Depot was
$20 a battery too. I picked up a battery + charger for $39. So, looks like
the 1VPX battery is the "magic bullet" to be explored."
When you are testing this "magic bullet", please explore and share at what
amperage drain is needed to shatter this bullet and burst into flames (if
it will in fact do so), and if it is somehow protected to prevent this. No
matter, a nice number to know and fuse or fusible link short of that
'short' number if no internal protection provided.
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Sure. After I've fully explored the chemistry I'll take
one apart and see what fusible links, over-temp switches,
etc have been included in fabricating the device. I'll
also do a dead-short test on one to see how it behaves.
| Quote: | Another concern is bursting into flames during charging if overcharged.
Worth it to have a good look at charger, and see just how robust circuit
is to failing in overcharge mode.
Also is there protection to prevent discharge to point it will damage
cells?
On purpose discharge only 1 cell of the 2 cell pack to lets say 1.75
volts. Then go charge and see if charger is smart enough to not burn the
house down.
When you are on purpose testing, not a bad idea to do so over an area that
will not catch fire, and hang a plastic bag with sand in it over battery.
This way "when" it catches fire it will melt bag and extinguish.
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Given the recent events on battery fires (limited to
certain combinations of chemistry) there is increased
focus on LiIon battery battery safety. I would be surprised
if B&D hasn't covered all the bases here. While LiIon
may be the acknowledged wave of the future, a company
with pockets as deep as B&D is going to do everything
they can to keep cash-diggers at arms length. Besides,
it's really bad for business if the peddlers of
crisis du jour point their fingers at you an scream "Fire Bug".
I think we're on pretty good ground for safety. The
issues to be resolved will probably hinge on performance.
UL is going to do the beat-n-bash on this product.
I suspect my friends a the Crane Navel Battery
Testing Labs will get their hands on them too. I'll
make some phone calls.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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