[BC] batteries

[Broadcast List USER]

MANY chargers, especially the smart ones, won't try to charge a  
discharged battery -- that would likely be anything beyond 80%  
discharged.  The Current is too high for the Voltage applied; so they  
vastly reduce the Voltage applied.  Now, in some situations, leaving  
it connected for a few days will build up the charge on the battery  
enough for the charger to actually do it's thing.

However, connecting another battery in parallel will actually apply  
enough of a charge for the charger to work.

Yep, sad, but true.

Also, some STUPID chargers can also charge the battery.  Good news,  
bad news.  For a short period of time, it can be OK, for a long period  
of time, one can boil out the water, and kill the battery in a short  
period of time.

--chipo

On Nov 3, 2010, at 1:29 AM, broadcast-request at radiolists.net wrote:

>Message: 2
>From: Jeff Johnson <jeff at rfproof.com>
>
>Zapping the completely discharged battery (lights on overnight) with a good battery - charger NOT connected - would subsequently allow the charger to begin running current through the battery in reverse to reverse the chemical state of the plates from lead back to lead oxide. I think the problem lies in sulfation of the plates while discharged. Chemists  in the crowd??