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Battery chargers.

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pwmac(at)sisna.com
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Posted: Mon Apr 19, 2010 3:46 pm Post subject: Battery chargers.

[quote]Read this link an tell me your comments. News to me.   http://www.optimabatteries.com/product_support/resuscitating_agmbattery.php     [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Apr 22, 2010 5:16 pm Post subject: Battery chargers.

At 06:35 PM 4/19/2010, you wrote:



  	  Quote: 	
		   	  Quote: 	
		  

Read this link an tell me your

comments. News to me.



http://www.optimabatteries.com/product_support/resuscitating_agmbattery.php

	
	


   "Resuscitation" is not a narrowly defined operation.

   When an RG battery is so severely discharged that

   its open circuit voltage is too low to tell a smart

   charger to wake up, its a common practice to add an

   extra boost from either another battery or perhaps

   some form of bench supply.



   When Concorde gets a "dead" one back, they'll do

   a recovery experiment that starts with hooking a

   12v battery to a 20 or more volt power supply until

   the chemistry is stirred up enough for the discharged

   battery to start taking in energy. After the recovery

   current rises sufficiently, the charge can be completed

   with more conventional protocols.



   They'll charge, discharge and recharge several times

   while doing a cap-check during each discharge. If after

   3 cycles, the cap-check does not show sufficient capacity

   for return to service (typically 80% of nameplate) the

   critter was scrapped.



   Some would recover, some would not depending on how long

   they were held in a discharged state, at what temperature

   and what the age of the battery was. But aside from the

   extra-voltage jum-start, no special techniques were used.



   So when someone claims to have resurrected a dead battery,

   it's not clear exactly to what degree the battery has

   become useful. Without comparative cap-checks, there's

   no quantitative basis for claiming ressurection.



   Bob . . .    [quote][b]

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