Due to a charging problem with my Electric Motion 5.7 trials bike i left the battery discharged for a few months and the cells dropped down to around 2.0-2.4v over the course of several months. As these cells are no longer safe its time to build a new pack.
Original battery was 48v 24.5Ah lipo pack made with:
Kokam High power type SLPB82255140H cells 13S 0P
discharge of 196A (8c)
Peak discharge. 245A (10c)
With a cycle life of 90% DOD 1c/1c 6000 cycles 70% remaining capacity
Lower/upper limit 2.7-4.2v
https://kokam.com/skin/pc_en/img/cell_down/TDS_SLPB82255140H%20(24.5Ah)_EN.pdf
Controller is a Kelly KEB48601 24-48v 6kw BLDC
Cont. 130A
10sec. 350A
24-48V
Motor is 5KW BLDC stamped “HPM 5KW-15138” but i cant find any more info on it
Charger is 15A li ion/lipo 54.6v
I would like to end up with a pack similar in Ah and current draw as the old one. I would like to upgrade the BMS to either a spedict Neptune 20 because of its allowable current and display so I can monitor individual cells. or a similar BMS that one of you has had success with (please advise)
I am considering 14 cells in series and I have read this is good for pack longevity because each cell would have a lower peak charge voltage. using my 54.6v charger 13s = 4.2/cell and 14s = 3.9v/cell at full charge. Is this a good idea, Necessary ?
Seems like building with cylindrical cells and soldering/welding tabs on for connections is popular but would require more research tools and time to build a new pack. I’m ok with this if it is necessary but am mostly interested in lipo
I have looked at a few websites that sell RC LiPo packs but by the time I put enough together in series and parallel to achieve both 25Ah capacity (approx) and 48v the price is extremely high
These A123 NMC 26Ah lithium ion pouches would fit nice but I’m not sure what’s real or fake (especially on alibaba)
Here is one site with a good price but i cant find the constant and max Amp draw for these cells
https://a123batteries.com/a123-systems-3-7-volt-26ah-prismatic-pouch-cell-amp26-nmc/. $28.00 x 14 = $392
I’m located on Vancouver Island BC Canada if any locals out there know of Canadian distributors ?
Any info, suggestions or questions are much appreciated thanks.
Original battery was 48v 24.5Ah lipo pack made with:
Kokam High power type SLPB82255140H cells 13S 0P
discharge of 196A (8c)
Peak discharge. 245A (10c)
With a cycle life of 90% DOD 1c/1c 6000 cycles 70% remaining capacity
Lower/upper limit 2.7-4.2v
https://kokam.com/skin/pc_en/img/cell_down/TDS_SLPB82255140H%20(24.5Ah)_EN.pdf
Controller is a Kelly KEB48601 24-48v 6kw BLDC
Cont. 130A
10sec. 350A
24-48V
Motor is 5KW BLDC stamped “HPM 5KW-15138” but i cant find any more info on it
Charger is 15A li ion/lipo 54.6v
I would like to end up with a pack similar in Ah and current draw as the old one. I would like to upgrade the BMS to either a spedict Neptune 20 because of its allowable current and display so I can monitor individual cells. or a similar BMS that one of you has had success with (please advise)
I am considering 14 cells in series and I have read this is good for pack longevity because each cell would have a lower peak charge voltage. using my 54.6v charger 13s = 4.2/cell and 14s = 3.9v/cell at full charge. Is this a good idea, Necessary ?
Seems like building with cylindrical cells and soldering/welding tabs on for connections is popular but would require more research tools and time to build a new pack. I’m ok with this if it is necessary but am mostly interested in lipo
I have looked at a few websites that sell RC LiPo packs but by the time I put enough together in series and parallel to achieve both 25Ah capacity (approx) and 48v the price is extremely high
These A123 NMC 26Ah lithium ion pouches would fit nice but I’m not sure what’s real or fake (especially on alibaba)
Here is one site with a good price but i cant find the constant and max Amp draw for these cells
https://a123batteries.com/a123-systems-3-7-volt-26ah-prismatic-pouch-cell-amp26-nmc/. $28.00 x 14 = $392
I’m located on Vancouver Island BC Canada if any locals out there know of Canadian distributors ?
Any info, suggestions or questions are much appreciated thanks.