My first ebike and my first battery(48v 13ah chinese cells) so i was trying to follow what i read on the net for li ion battery longevity,and for 1 year that i have my battery i almost always charged to 90%(53v) except once a month when i charged to 100% and tried never to le the batterey drain beneath 10%( the 90%-10% =80% use!)!
Now my baterry doesnt go above 54v on a 4ah charger and 52v on a 2ah charger and is totally unbalanced even if i leave it on the charger for a whole day ,this is the voltage of the 13s:
1)3,75 V
2) 4,13
3)3,95
4 3,85
5)4,18
6)4,19
7)4,21
8)4,23
9)4,20
10)4,22
11)4,22
12),4,22
13)4,22
I went to a couple of battery techs and both told me that it whas my fault that the battery is like this because charging the way i did i didnt let the BMS do its work balancing the cells and by doing so when i unpluged the charger the first series had charged and the others where lower charged so the first series took all the abuse and that is why they are in this condition and there is nothing i can do about it any more!
I asked them if they can manualy balance the 1,2,3,4 series and they both told me that yes ,it will cost me save your money because it is just a waist of time,the cells might charge fully but again will drop to 3,75v .3,95,....,.....,because the cells are bad!
I asked if they can change the bad cells and they both told me no because by putting in new batteries in the pack the pack will go bad quickly again!
I had the BMS changed with an excact same one i had laying around but again i got the same readings,could it be a problem caused by the BMS and both my BMS are faulty?
Any ideas anyone?
And is it a fact that by charging the way i did i caused the problem to the battery?
And if yes what is the proper way to charge to get the most cycles out of a battery?
Now my baterry doesnt go above 54v on a 4ah charger and 52v on a 2ah charger and is totally unbalanced even if i leave it on the charger for a whole day ,this is the voltage of the 13s:
1)3,75 V
2) 4,13
3)3,95
4 3,85
5)4,18
6)4,19
7)4,21
8)4,23
9)4,20
10)4,22
11)4,22
12),4,22
13)4,22
I went to a couple of battery techs and both told me that it whas my fault that the battery is like this because charging the way i did i didnt let the BMS do its work balancing the cells and by doing so when i unpluged the charger the first series had charged and the others where lower charged so the first series took all the abuse and that is why they are in this condition and there is nothing i can do about it any more!
I asked them if they can manualy balance the 1,2,3,4 series and they both told me that yes ,it will cost me save your money because it is just a waist of time,the cells might charge fully but again will drop to 3,75v .3,95,....,.....,because the cells are bad!
I asked if they can change the bad cells and they both told me no because by putting in new batteries in the pack the pack will go bad quickly again!
I had the BMS changed with an excact same one i had laying around but again i got the same readings,could it be a problem caused by the BMS and both my BMS are faulty?
Any ideas anyone?
And is it a fact that by charging the way i did i caused the problem to the battery?
And if yes what is the proper way to charge to get the most cycles out of a battery?