12V non-spillable battery reads 6V on multimeter - is it permanently dead?

mitko1994

Newly Enlightened
Joined
Jun 13, 2015
Messages
4
Hi everyone, I'm not sure if this is the right section to post this in but here it is anyways. I have a 12V, 7.2A non-spillable battery that came with a fishfinder I bought second hand. It was so dead that it didn't even power up the fishfinder. I decided to charge it with my 12V 10/2A charger. I set it 10A and automatic charge and waited for an hour but the meter needle never moved. I tried switching to manual charge mode to force some charge in it thinking that it was so dead that automatic mode didn't detect the charger was hooked to a battery. After an hour in manual mode the needle still didn't move so I used my multi meter on the battery and it read 6V. Is the battery irreversibly dead?
Note: the charger is not broken - I charged another battery on it.
 

FlashKat

Flashlight Enthusiast
Joined
Mar 18, 2006
Messages
2,364
Location
Anaheim, CA.
I have been reading up on batteries with low voltage, and there is a possibility to revive it. Reading about how to desulfate batteries it tells you how it works, and to revive a dead battery. I may be wrong, but it never hurts to try.
 
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