Not sure about the donkey idea
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think of the smell
mmm 612 isnt that many really but then not knowing how hard they have been worked its hard to say, if your pulling current out of them above their C rating then it wouldnt surprise me if they have started to keel over
Tricky one really, I presume they are all nicely watered up and you have CHECKED this and not just gone on the auto watering device I think the G-wiz uses ??
So what are we saying you've got about 18k miles out of them working on an average of say 30miles per cycle ?? not bad really. be intersting to see what your recharge costs are and the cost of the batteries orginally and then add them together and find the equivilant if you have been using petrol/deisel ?
I did that some time ago with my Fiesta and it actually worked out more expensive
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but then fuel was a lot cheaper then and I only worked on 500 cycles.
There was a chap on here that was doing something with pulse rejuvinators I seem to remember, he was in Reading I think ?? but I feel thats only any good if they are suphated, I feel yours could be due to lose of active material
Always the worse bit when the batts die in EV's, but you have to remember its like buying all your fuel up front
ChrisB