mindgames11
1 W
So I have a little 14 inch folder with a hub motor that I was looking to give to someone else. The bike should have a 10s3p(staggered cell orientation, side by side grid is too large) pack which fits snugly inside the main horizontal tube, accessible when broken open to fold. When I bought this, it came with a tiny 10s2p water bottle battery that had been poorly modded with tape to allow connection to the bike.
Besides the water bottle being a little too weak for the task and not being physically an ideal match, I kind of like it and it's rather unique in my battery collection. Also, I have not been able to coax out the cells to take a peek at them.
I have three m365/gotrax 10s3p scooter battery packs (26e(i think.), 35E, and I don't remember the third). I was just nibbling off the plastic frame to get it to fit in the folding bikes tube, then I attached some balance leads and right before I was about to do a final connection decided to check the voltages and sure enough, the pack was reading low- between groups 3-4 I was getting 0v. since I havent yet taken it apart, I don't know if one cell died and has caused the other five cells that it's connected with to kick the bucket as well, or if the paired cells have survived. some insight into this would be appreciated.
also, on the subject of bad cells in packs of many that have not failed- is it possible to create/adjust an existing cell to the characteristics of the other cells in the battery?
the difficulty sometimes with finding matching cells, especially when operating on the cheap (I'm working from existing bike/scooter packs) is a hurdle and being able to alter cells (or by using some kind of software correction akin to how the hubble space telescope used software to correct the optical aberration in the mirror) would be swell.
I tested a pair of MJ1 cells that I pulled from a 10s4p pack (with the intention of combining it with some other MJ1 cells for a 13s5p rectangular battery case that recently arrived) and got odd results. I actually unplugged my tester like an hour ago so lost the exact figures, but the mAh capacity between the cells differed by like 150 while the mWh capacity was nearly identical (within 20 in a number like 10,000). The internal resistance differed by about 20mΩ
I don't really understand this. I suppose that the cells made different amounts of energy at different voltages (although seemingly the same OVERALL amount of energy), but still don't quite understand the process or implications of the outcome.
lastly, does anyone recognize this battery pack and is able to tell me about what cells are inside it/what configuration?
I'm likely going to take it apart since I feel like it's not charging properly (with the boost module that I often use for charging, at least.a
Besides the water bottle being a little too weak for the task and not being physically an ideal match, I kind of like it and it's rather unique in my battery collection. Also, I have not been able to coax out the cells to take a peek at them.
I have three m365/gotrax 10s3p scooter battery packs (26e(i think.), 35E, and I don't remember the third). I was just nibbling off the plastic frame to get it to fit in the folding bikes tube, then I attached some balance leads and right before I was about to do a final connection decided to check the voltages and sure enough, the pack was reading low- between groups 3-4 I was getting 0v. since I havent yet taken it apart, I don't know if one cell died and has caused the other five cells that it's connected with to kick the bucket as well, or if the paired cells have survived. some insight into this would be appreciated.
also, on the subject of bad cells in packs of many that have not failed- is it possible to create/adjust an existing cell to the characteristics of the other cells in the battery?
the difficulty sometimes with finding matching cells, especially when operating on the cheap (I'm working from existing bike/scooter packs) is a hurdle and being able to alter cells (or by using some kind of software correction akin to how the hubble space telescope used software to correct the optical aberration in the mirror) would be swell.
I tested a pair of MJ1 cells that I pulled from a 10s4p pack (with the intention of combining it with some other MJ1 cells for a 13s5p rectangular battery case that recently arrived) and got odd results. I actually unplugged my tester like an hour ago so lost the exact figures, but the mAh capacity between the cells differed by like 150 while the mWh capacity was nearly identical (within 20 in a number like 10,000). The internal resistance differed by about 20mΩ
I don't really understand this. I suppose that the cells made different amounts of energy at different voltages (although seemingly the same OVERALL amount of energy), but still don't quite understand the process or implications of the outcome.
lastly, does anyone recognize this battery pack and is able to tell me about what cells are inside it/what configuration?
I'm likely going to take it apart since I feel like it's not charging properly (with the boost module that I often use for charging, at least.a
