Hello folks
I have a few newbie questions on "broken" batteries from an electric car.
The scenario:
24 2V maintaince free batteries, 150ah (5 hour) are connected in a series providing 48V to drive the car.
The car has not been used for 1½ year, which means that the batteries are close to, if not already, dead.
When I initially got the car each battery gave approximatly 0.3v-0.7v and I thought that the battle were over even before it started. - even though I tried to connect a 10A battery charger to 6 of the batteries with 13.5V charge, and after some time, the amneter started to rise, when the amneter hit 2A-4A I went on to 6 others and so forth until there were reaction on all 24 batteries, this took a few days.
At this point I thought that the cars charger might be able to take on charging (instead of the external battery charger I had been using) - but that didnt work - it would charge for some hours and the stop again.
At this time (after the batteries had rested for 5 hours with) the charge were at 0.7V-1.04V.
Now I'm back on 2 external chargers, each charging 12 batteries at 26V/10A, they have been charging for almost 2 days now - the amneter on both says close to 7A, and it seems that it has stopped climbing.
When I messure the voltage on the individual batteries, when charging, there are some "abnormalities", most of the batteries is in between 1.5-1.8V but a few batteries (as in two batteries) is up on 2.5V, and a single one up on 3.3V.
Which brings me to my question (one that I should have asked before "try/error")
How can I regenerate (if possible) these kind of damaged batteries - and are the approach that I've taken completely off track?
(As stated I'm newbie, so here's one from the newbiebook)
when the amneter on my charger says 7A and have stoppet climbing - what information can I get from that:
- : Why did it stop climbing and why 7A?
- : Should I expect it to fall again when the batteries stop accepting charge?
- : The two batteries where the voltage is approx 2.4-2.6V when charging and in particular the one with the 3.3V - are they "even more" dead and am I killing them more by doing what I'm doing?
I hope I've made myself undestandable, and thanks in advance for any help and guidance.
*/Kasper