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  1. I recently pulled my battery out of my car after having it disconnected for ~12 months (slow self-discharge). I made the reasonably smart move of disconnecting the battery from the car electrics itself 12 months ago, otherwise I wouldn't be telling this story, most likely! So I put the battery on my battery charger that only starts on 5V minimum, wouldn't even begin charging... Pulled out the multimeter and checked and it was on a whopping 3.09 Volts... trouble... Bought another battery recovery device that starts at 0.5V and kicked off the charging process with a largely pessimistic outlook. After about 45 minutes it had got the voltage up to about 5.3V but it had stopped there stating the battery had a fault and would not take charge... thought bugger it I'll chuck on the original charger and it started and ran for about 12 hours and got it up to about 11.1 volts and had given up... still not looking good. Connected the new battery recovery charger again and it "tested OK" this time, wow! surprised... beginning to get optimistic here... kept it on charge for almost 4 full days and it sloooooooooooooooooooooooooooooooooooowly recovered voltage. This battery is a SMF/AGM type so it has calcium added to prevent bubbling so it doesn't need replenishing of water reservoirs... in the end it got up to 14.03 volts (while charging). Still could be bad... so the advice online tended to say to leave it for 12-24 hours after you finish charging it and if it still reads above 12.7 volts you've probably got a healthy battery So I left it and it settled down on 12.83 volts I was happy, to say the least Question for you guys... what's the lowest voltage you've ever recovered a battery from?
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