Minexplorer
100 µW
- Joined
- Jan 19, 2018
- Messages
- 7
Hi ,my question is pretty pointless now really, but i still irk for answers and would appreciate some understanding of what went wrong.Especially as it totally ruined my e biking experience. Much thanks in advance,if anyone can shed any light.
It started with my BBSHD build.my samsung 30Q (sdi 136 cells) 5P 52 volt battery started playing up 3 years ago with just 12 months of use on the BBSHD. At the BMS i found 6 of the 14 cell groups were at lower voltages. manually charging them to close resolved the issue of the battery hitting the LVC of 42 v when it still had say 47 volts remaining.It began holding right to the LVC even on bursts of 30 amps.Though they were still not fully 4,2 v, it didnt last long tho and got worse,i just could not get them to fully reach the same voltage of the other 8 groups. i tried adjusting the charger to only charge to the lowest group voltage. Again it worked for a while then the battery would sag and hit the LVC under sudden high load ,like hills and hitting the throttle, with as high as 50 volts remaining on the display.
People advised me it was trash and i had some bad cells. Inquiries for repair got quotes of £400 .i read the 30Q was a crap cell prone to discharge issues. It got to the point i couldnt trust going out on it. The bike would go at any time under a higher load demand once the voltage was down to 50/52 volts. The battery got chucked under the bed a year or more ago charged up. Today those 8 good cell groups are reading 3.84 volts,the bad groups 3.68 ,3.65 ,3.52 ,3.47, 3.25 ,3.00.
So ive been stripping it down and found it seems to have ultimately 14 sets of 5 cells.Which the 14 wires at the BMS obviously refer to.Im not going to attempt to understand the complicated way these are joined into 7 sets of 10 then to other sets,i was expecting to see the cells joined somehow in 14s. However what has surprised me is i haven't found a handful of random bad cells. All 5 cells in a 'bad' group have the same voltage as each other,after the nickle strip joining them is removed ???
Please someone tell me it wasn't the BMS and ive just trashed a £450 battery for a lifetime supply of vape batteries.I did try many times manually charging the lower cell groups and they never fully came up to the good ones ,getting slowly worse over time.
I havent yet gotten to trying to recharge the low cells. The better cell groups so far are reaching 4.08v-4.12v. I admit i did hammer that battery with the BBSHD tons of full 30 amp whizzing around and constantly running it down to the LVC and having to walk the last cpl uphill miles home. A 5P 30q battery is supposed to be able to handle 37.5 amps continuous or 75 amps for bursts i thought . Was there anything else i could have done im wondering.thanks
It started with my BBSHD build.my samsung 30Q (sdi 136 cells) 5P 52 volt battery started playing up 3 years ago with just 12 months of use on the BBSHD. At the BMS i found 6 of the 14 cell groups were at lower voltages. manually charging them to close resolved the issue of the battery hitting the LVC of 42 v when it still had say 47 volts remaining.It began holding right to the LVC even on bursts of 30 amps.Though they were still not fully 4,2 v, it didnt last long tho and got worse,i just could not get them to fully reach the same voltage of the other 8 groups. i tried adjusting the charger to only charge to the lowest group voltage. Again it worked for a while then the battery would sag and hit the LVC under sudden high load ,like hills and hitting the throttle, with as high as 50 volts remaining on the display.
People advised me it was trash and i had some bad cells. Inquiries for repair got quotes of £400 .i read the 30Q was a crap cell prone to discharge issues. It got to the point i couldnt trust going out on it. The bike would go at any time under a higher load demand once the voltage was down to 50/52 volts. The battery got chucked under the bed a year or more ago charged up. Today those 8 good cell groups are reading 3.84 volts,the bad groups 3.68 ,3.65 ,3.52 ,3.47, 3.25 ,3.00.
So ive been stripping it down and found it seems to have ultimately 14 sets of 5 cells.Which the 14 wires at the BMS obviously refer to.Im not going to attempt to understand the complicated way these are joined into 7 sets of 10 then to other sets,i was expecting to see the cells joined somehow in 14s. However what has surprised me is i haven't found a handful of random bad cells. All 5 cells in a 'bad' group have the same voltage as each other,after the nickle strip joining them is removed ???
Please someone tell me it wasn't the BMS and ive just trashed a £450 battery for a lifetime supply of vape batteries.I did try many times manually charging the lower cell groups and they never fully came up to the good ones ,getting slowly worse over time.
I havent yet gotten to trying to recharge the low cells. The better cell groups so far are reaching 4.08v-4.12v. I admit i did hammer that battery with the BBSHD tons of full 30 amp whizzing around and constantly running it down to the LVC and having to walk the last cpl uphill miles home. A 5P 30q battery is supposed to be able to handle 37.5 amps continuous or 75 amps for bursts i thought . Was there anything else i could have done im wondering.thanks