Hi all,
I have a 1200W 60V electric scooter which was left in the wild world of rain, plants and lonelyness for a couple of years. It had 5 12V 22Ah AGM batteries which were dead. I tried to charge them but they did not hold any charge.
I decided to make myself a Lithium Ion battery pack. It is a 16s7p battery made with Panasonic NCR18650PF cells (3.6V 2900mAh 10A). The battery pack is connected to a BMS from aliexpress. I used pure nickel strips (0.15 x 6mm) which where 4 times spot welded on every battery pole. I used 7 strips for every series connection. The internet shows me that it could handle at least 4.7A per strip and 7A per strip was possible. On both ends of the pack I took one long stretch of 2.5mm copper wire which I soldered in between the cells on the nickel strip with a big soldering iron to reduce the time exposed to heat. Immediatly blowed cold air on it to cool after it flowed like I wanted. All the cell groups had the same voltage.
I tried the scooter with the new battery pack, but still the same result. It isn't strong enough to just ride me on a small uphill. The battery meter (which I think is just a voltmeter) went all the way in red when accelerating. I guess the red zone is less than 20%, but for lead acid voltages. It hit 30km/h max while it supposed to go 50km/h. I charged it to 67.2V and nothing changed except that the voltage doesn't drop that hard.
I opened up the controller to check for maybe burned mosfets or something. And I found that 1 of the 3 shunts is missing. I swapped it out with the 36V-72V 3000W bluetooth controller from Lunacycle. I had to solder the old connectors on it to connect it to the scooter but everything was straight forward. The controller connected to bluetooth and saved the settings like it should. I had to swap 2 phase wires for it to work properly, but still no progress. It still does 35km/h and has no pulling power.
I opened up one side of the hub motor (and broke a bolt
) but nothing seems burned or had a smell. I measured between single phases and the motor cover, but no connection so that was not the problem. The motor moves smoothly even when the cables are disconnected. It does cog when I connect 2 phases like it should.
I found some specs online:
https://m.globalsources.com/si/AS/Zhejiang-Haoren/6008837963258/pdtl/electric-scooter/1031106928.htm
Has anyone had kind of like this situation? Or can someone help me?
I have a 1200W 60V electric scooter which was left in the wild world of rain, plants and lonelyness for a couple of years. It had 5 12V 22Ah AGM batteries which were dead. I tried to charge them but they did not hold any charge.
I decided to make myself a Lithium Ion battery pack. It is a 16s7p battery made with Panasonic NCR18650PF cells (3.6V 2900mAh 10A). The battery pack is connected to a BMS from aliexpress. I used pure nickel strips (0.15 x 6mm) which where 4 times spot welded on every battery pole. I used 7 strips for every series connection. The internet shows me that it could handle at least 4.7A per strip and 7A per strip was possible. On both ends of the pack I took one long stretch of 2.5mm copper wire which I soldered in between the cells on the nickel strip with a big soldering iron to reduce the time exposed to heat. Immediatly blowed cold air on it to cool after it flowed like I wanted. All the cell groups had the same voltage.
I tried the scooter with the new battery pack, but still the same result. It isn't strong enough to just ride me on a small uphill. The battery meter (which I think is just a voltmeter) went all the way in red when accelerating. I guess the red zone is less than 20%, but for lead acid voltages. It hit 30km/h max while it supposed to go 50km/h. I charged it to 67.2V and nothing changed except that the voltage doesn't drop that hard.
I opened up the controller to check for maybe burned mosfets or something. And I found that 1 of the 3 shunts is missing. I swapped it out with the 36V-72V 3000W bluetooth controller from Lunacycle. I had to solder the old connectors on it to connect it to the scooter but everything was straight forward. The controller connected to bluetooth and saved the settings like it should. I had to swap 2 phase wires for it to work properly, but still no progress. It still does 35km/h and has no pulling power.
I opened up one side of the hub motor (and broke a bolt

I found some specs online:
https://m.globalsources.com/si/AS/Zhejiang-Haoren/6008837963258/pdtl/electric-scooter/1031106928.htm
Has anyone had kind of like this situation? Or can someone help me?