- Joined
- Mar 25, 2013
- Messages
- 4,616
Too much voltage. I was gonna use the 48v pack from my ebike...
-
Welcome back Guest! Did you know you can mentor other members here at H-M? If not, please check out our Relaunch of Hobby Machinist Mentoring Program!
How Do I Find This Connector?
- Thread starter rwm
- Start date
- Joined
- Apr 23, 2018
- Messages
- 6,532
Roll your own! @mattthemuppet2 has built some good ones and put up pics here. Round cell lithiums are cheap. Remember when we all had to build our own with NiCd back in the day?
- Joined
- Sep 28, 2013
- Messages
- 4,306
Just make your own, a 3.7v pack will be dead ready to make. I probably have a few flat lipo cells you can have for postage. I certainly have a pile of regular 18650 cells you can have.
Oof Pontiac, that's a sore point right now. I just spent a week very VERY carefully rebuilding my 40v/ 40 cell bike battery and it WORKED! Until I put it in the pack and knocked loose a cold solder joint on the cell monitoring side. That one little mistake = fubarred pack and a week wait for a $700 new one from the bike shop
Still pee'd off about it..
Oof Pontiac, that's a sore point right now. I just spent a week very VERY carefully rebuilding my 40v/ 40 cell bike battery and it WORKED! Until I put it in the pack and knocked loose a cold solder joint on the cell monitoring side. That one little mistake = fubarred pack and a week wait for a $700 new one from the bike shop
Still pee'd off about it..
- Joined
- Apr 23, 2018
- Messages
- 6,532
Uff, that's a fresh scab, sorry! See, battery pack soldering is best left to the professional Bangladeshi children who make them. I've updated my advice. Thanks, Matt!
- Joined
- Sep 28, 2013
- Messages
- 4,306
Well the pack is beautifully made in my opinion, it just doesn't work 
- Joined
- Apr 23, 2018
- Messages
- 6,532
Let's see... that's up, up, down, down, three up, three down, three up again... wait, let me start over. From the other corner this time. Two down, three up, two down... I'm lost, there's going to be a short in there somewhere.
- Joined
- Sep 28, 2013
- Messages
- 4,306
I think I might jury rig it to my lawn mower battery, give it a bit more oomph. Here's proof that it worked Still, pee'd off!
Still, pee'd off!- Joined
- Sep 28, 2013
- Messages
- 4,306
a closed short would be dead easy to find - there'll be a bright flash, an after glow and then the smell of burnt metal and plastic The batteries are very well spot welded together. The problem came from the battery protection board on the top. If it gets disconnected from any part of the battery (there are connections to each bank of four cells) then it permanently shuts down the battery and it won't turn the bike on. The wires at the top that you can see coming from the battery go to another 10 cell battery piggybacked onto the battery board to trick it into thinking it's all connected. However, when I reconnected one of the banks to the protection board (pulling out the piggyback wire VERY carefully at the same time) I must have made a cold joint that looked good, seemed good, but then opened when I was finagling it back into the case. Joint opened, protection board thought that one of the battery banks had disappeared, pack is bricked.
The batteries are very well spot welded together. The problem came from the battery protection board on the top. If it gets disconnected from any part of the battery (there are connections to each bank of four cells) then it permanently shuts down the battery and it won't turn the bike on. The wires at the top that you can see coming from the battery go to another 10 cell battery piggybacked onto the battery board to trick it into thinking it's all connected. However, when I reconnected one of the banks to the protection board (pulling out the piggyback wire VERY carefully at the same time) I must have made a cold joint that looked good, seemed good, but then opened when I was finagling it back into the case. Joint opened, protection board thought that one of the battery banks had disappeared, pack is bricked.