I think if there was a short and fire situation from the drops, it would happen shortly after the drops. But now you've removed the waterproofing, it's even more of a hazard than it was, unless you are fully capable of rewrapping it successfully...
I don’t think it’s going back into service as is. There is damage to wires and I’ve taken photos of the case damage in the r/battery thread. I do have an identical replacement case and frame component, so best case is tare down more, test more, and rewire. Or recover cells.
The first thing I noticed was the pinch from the case. The battery came with a kit from Grin Technology. They are known for their motors, which are stellar, and my impression being generic but better quality 3rd party kit components that are vetted with their products. This battery is also a slightly different spec. 36V but 26ah 950wh. So bigger and heavier than most batteries. Considering its age, use time, and this being the third low height drops/slip. While the wiring isn’t ideal. I’m gonna give this build a 5/5 stars because it didn’t explode ha. Yet?!?!?
To answer your questions.
1. I exposed the cells a bit more by cutting some paper away. They are all red and all I can see is Sanyo and a QR code very faintly printed in transparent ink or something. I doubt I can get my phone to pick it up. The orientation is tucked away between cells.
2. No visible damage to the cradle or cells, no heat. I posted photos of the case in the /battery post.
3. Can’t see much but yes, I spotted a small amount of corrosion. I used a piece of paper and poked around to see if it would slide under anything. Spot welds look good. I think I’m going to cut away the paper more so I can fold it completely down and get a good shot of each side flat on.
4. This battery was bought in 2021, and I’ve been using it on a fairly consistent route. It still performs consistently between charges accepting some performance loss from age. I charge to %80 mostly and also drain it to shut off from time to time. It doesn’t experience sub-zero c temps.
5. No idea about the bms, more takedown would be required and I’m not up there, yet. Soon I think.
I’m interested in building my own eventually and this might be the opportunity to learn. Safety provided. Thanks for your comment!!!
I’ve removed the wrapping/tape and looked at it. No obvious signs of major damage. Cable sheaths worn, wires pinched, one battery lead wire stuck to the wrapping, I’ve covered it with electrical tape now. Wire to the side power meter broke.
I think this battery has been dropped 3 times now. The shell is cracked good and I have a replacement. But I still don’t know if I’m holding on to a fire… I’ve moved the battery from my house to detached garage space somewhere else.
Major ??? There is a video of this, I pushed in on the wrapping in a specific spot and there is a click noise. It stops after and then I can repeat it. I believe that a weld perhaps broke? I think I identified the cell.
I think it’s about half full or more.
Is this battery safe?
If so, what do next?
A. Poke around with a volt meter? Try and diagnose more myself in hopes of DIY repair?
B. Find a repair shop?
C. Buy a new battery and tare this down and do something else with the cells after testing each one for unseen damage?
D. Take more pictures and report back?
How is this build quality? Should I find the supplier and get another one?
burieddeepbetween@reddit
I think if there was a short and fire situation from the drops, it would happen shortly after the drops. But now you've removed the waterproofing, it's even more of a hazard than it was, unless you are fully capable of rewrapping it successfully...
Space_Lllama@reddit (OP)
I don’t think it’s going back into service as is. There is damage to wires and I’ve taken photos of the case damage in the r/battery thread. I do have an identical replacement case and frame component, so best case is tare down more, test more, and rewire. Or recover cells.
NotASockPuppet88@reddit
It being "dropped" is not of concern.
The bigger concern is poor build quality whereby the wires getting pinched and eventually cut seems acceptable by the manufacturer
This pack was a liability even before it was dropped.
Space_Lllama@reddit (OP)
The first thing I noticed was the pinch from the case. The battery came with a kit from Grin Technology. They are known for their motors, which are stellar, and my impression being generic but better quality 3rd party kit components that are vetted with their products. This battery is also a slightly different spec. 36V but 26ah 950wh. So bigger and heavier than most batteries. Considering its age, use time, and this being the third low height drops/slip. While the wiring isn’t ideal. I’m gonna give this build a 5/5 stars because it didn’t explode ha. Yet?!?!?
To answer your questions. 1. I exposed the cells a bit more by cutting some paper away. They are all red and all I can see is Sanyo and a QR code very faintly printed in transparent ink or something. I doubt I can get my phone to pick it up. The orientation is tucked away between cells. 2. No visible damage to the cradle or cells, no heat. I posted photos of the case in the /battery post. 3. Can’t see much but yes, I spotted a small amount of corrosion. I used a piece of paper and poked around to see if it would slide under anything. Spot welds look good. I think I’m going to cut away the paper more so I can fold it completely down and get a good shot of each side flat on. 4. This battery was bought in 2021, and I’ve been using it on a fairly consistent route. It still performs consistently between charges accepting some performance loss from age. I charge to %80 mostly and also drain it to shut off from time to time. It doesn’t experience sub-zero c temps. 5. No idea about the bms, more takedown would be required and I’m not up there, yet. Soon I think.
I’m interested in building my own eventually and this might be the opportunity to learn. Safety provided. Thanks for your comment!!!
5ma5her7@reddit
Please tell me you wrapped the paper around it for a temporary fix, and it's not built like this...
Space_Lllama@reddit (OP)
Thank you for fully reading the first line of the post ☺️
5ma5her7@reddit
Can't see it in crosspost though...
Space_Lllama@reddit (OP)
Is it best practice to double up on the post? I haven’t had the need to cross post before.
englebert@reddit
Depends how much you want people to help/care really.
Space_Lllama@reddit (OP)
I’ve added the post text as a comment, can’t edit the cross post I guess. I’ll know for next time. Thanks.
5ma5her7@reddit
Best to write in the comment of your crosspost if it's an important detail.
Space_Lllama@reddit (OP)
OP text:
Photos are after I removed the case.
I’ve removed the wrapping/tape and looked at it. No obvious signs of major damage. Cable sheaths worn, wires pinched, one battery lead wire stuck to the wrapping, I’ve covered it with electrical tape now. Wire to the side power meter broke.
I think this battery has been dropped 3 times now. The shell is cracked good and I have a replacement. But I still don’t know if I’m holding on to a fire… I’ve moved the battery from my house to detached garage space somewhere else.
Major ??? There is a video of this, I pushed in on the wrapping in a specific spot and there is a click noise. It stops after and then I can repeat it. I believe that a weld perhaps broke? I think I identified the cell.
I think it’s about half full or more.
Is this battery safe?
If so, what do next?
A. Poke around with a volt meter? Try and diagnose more myself in hopes of DIY repair?
B. Find a repair shop?
C. Buy a new battery and tare this down and do something else with the cells after testing each one for unseen damage?
D. Take more pictures and report back?
Thank you for your assistance Reddit!