Rodbr Posted September 20, 2014 Report Share Posted September 20, 2014 Is there a way to recharge these after going completely flat. The smarter chargers wont recognise a battery even attached! going to try an old fashioned charger to see of they will kick start. Any other reco's Quote Link to post Share on other sites
RogerH Posted September 20, 2014 Report Share Posted September 20, 2014 Hi Rod, Is it a lead-acid type - if so they do not like recovering from 0V. NiCads and others will recover in fact they can go the other way and change their polarity but lead-acid ..... Could be terminal. Roger Quote Link to post Share on other sites
ctc77965o Posted September 21, 2014 Report Share Posted September 21, 2014 (edited) I had one of these, amazing current capabilities, but after leaving the lights on I killed it by bump starting the car... Since then it's "abuse friendly" std lead acid for me. I would be surprised if you can recover it.... Edited September 21, 2014 by ctc77965o Quote Link to post Share on other sites
Ian Vincent Posted September 21, 2014 Report Share Posted September 21, 2014 I have recovered one in the past by connecting to a standard battery charger for a while (a couple of hours) and then switching to the smart cycling one. Rgds Ian Quote Link to post Share on other sites
Rodbr Posted September 21, 2014 Author Report Share Posted September 21, 2014 Looks like three Deep cycle batteries are dead and one transgender 12volt leas acid which has turned into a 6volt. Tried over night with a traditional charger and only succeeded in getting a 6 volt. These were from my late fathers garage and he must have left them too long without charging, shame as I paid about £90 a pop for them 3 years ago. The Aldi/Lidl chargers work a treat and have one on the TR regardless of usage and use two more on a set of reserve batteries. Worth a try so I'll leave them outside the garage as someone will surely nick them, they nick everything else not screwed down. Quote Link to post Share on other sites
Steves_TR6 Posted September 21, 2014 Report Share Posted September 21, 2014 You might try a low current 'dumb' battery charger for a long time, ie days. I'm thinking less than an amp. This may revive them to a level than will accept a higher charge rate or 'clever' charger. Steve Quote Link to post Share on other sites
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