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Black and Decker VPX 7V LiIon Batteries

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nuckolls.bob(at)cox.net
Guest

Posted: Sun Nov 25, 2007 6:06 pm Post subject: Black and Decker VPX 7V LiIon Batteries

At 05:28 PM 11/25/2007 -0500, you wrote:



 	  Quote: 	
		  The 2VPX drill I want to get my hands on loads two of the 7 volt batteries 

in its base to obtain 14v.  As far as I can tell, the entire product line 

is standardized on the use of the 7 volt batteries.  At WalMart, the 

batteries are 19.99 each.


	


   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.

 	  Quote: 	
		  One concern I have is that the starting voltage of two of these cells in 

series, freshly topped off, might be enough to push some avionics to the 

limit.  What if there are 16v SMT devices in my Garmin 296 that will 

fizzle at a tad less, say 15.5 volts, and the fresh cells exceed that at 

the moment of initial use?  Something to get numbers for and think about.


	


   I just pulled one off the charger and it reads

   7.01 volts so a pair would be right in the

   appropriate ball-park.



   Bob . . .

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rparigor(at)SUFFOLK.LIB.N
Guest

Posted: Sun Nov 25, 2007 8:32 pm Post subject: Black and Decker VPX 7V LiIon Batteries

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.



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.



Ron Parigoris

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