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162 Posts
I bought 10 FLA 12 V, 105 AH crown deep cycle batteries, got 8 replaced due to bad cells (after some months of arguing).
I have now 10 new batteries (configuration is series, a 120 V pack). I can go shorter distances without trouble (about 10 km is fine), but suddenly two batteries are out of energy, while the other have more than half the charge left! This is the same scenario as with the other batteries...
All batteries were of course balanced and fully charged. (I use 10 smaller charger to top of the charge of each battery from time to time). They have enough water - but not too much. I also have a voltmeter for each battery so I can se the voltage drop as I drive. This is how I found the bad batteries (and because I could not get home...). At first, voltage drop is about the same for every battery, and then, quite suddenly two of them drops.
Why do I keep getting bad batteries? What am I doing wrong? These are supposed to be new, and have only about 10 cycles! I have contacted the company who sold them, and they have no clue... Was thinking about the cold (weather is about -3°C right now), but the failing batteries are insulated and in the middle of the pack, thus not the coldest ones. The batteries are next to each other, but I think it is a coincidence.
Max current is less than 250 battery amps, and the mean is less than 100.
I have now 10 new batteries (configuration is series, a 120 V pack). I can go shorter distances without trouble (about 10 km is fine), but suddenly two batteries are out of energy, while the other have more than half the charge left! This is the same scenario as with the other batteries...
All batteries were of course balanced and fully charged. (I use 10 smaller charger to top of the charge of each battery from time to time). They have enough water - but not too much. I also have a voltmeter for each battery so I can se the voltage drop as I drive. This is how I found the bad batteries (and because I could not get home...). At first, voltage drop is about the same for every battery, and then, quite suddenly two of them drops.
Why do I keep getting bad batteries? What am I doing wrong? These are supposed to be new, and have only about 10 cycles! I have contacted the company who sold them, and they have no clue... Was thinking about the cold (weather is about -3°C right now), but the failing batteries are insulated and in the middle of the pack, thus not the coldest ones. The batteries are next to each other, but I think it is a coincidence.
Max current is less than 250 battery amps, and the mean is less than 100.