pmmali said:
First, I don't know much much Ah on Each cell. each module is having 12 cells 40V I have 4 Modules. and I don't have a certain electric scooter. but I am repairing here electric scooters. So if this battery is capable to run an electric Scooter then I can build a 60V or 72V battery pack from this. my main problem is I don't know how much Ah is on each cell. is there any meter to measure the Ah capacity like these batteries?
Any cheap RC wattmeter capable of the voltage and current you need to operate at, probably less than $20 on Amazon, ebay, etc., will measure Ah, once you setup a load to test them. This is one possible meter
https://www.amazon.com/gp/product/B013PKYILS
but you will need to determine if it is suitable for your testing needs (if not, there are many others).
There are also electronic battery testing loads available; I've never used any of them so I don't know which would be suitable, but a few of the various battery / cell testing / build threads have some discussion of them.
To setup the load, you need to know how many A (amps, current-delivery-capability, not the same as Ah, Amp-hour, which is capacity) the cells can handle, because you don't want to overload them. If you setup too high a load, the cells will sag in voltage more than they should, and heat up more than they should, and won't supply as many Ah as they should be able to (because the excessive voltage sag will cause whatever you use to monitor testing for a safety shutoff, like a BMS, etc., to shutdown too soon).
If you read around the various cell-testing threads in the battery subforum (the one this thread is in), you can see how those tests are done, which may also help you find a way to determine how many A the cells can handle, experimentally, if this information isn't available anywhere based on the cell or pack markings vs information found online, etc., or based on what these packs do in the device or vehicle they came from.
Same for using them in a scooter (or anything else)--you have to know what the cells are capable of before you can use them safely/reliably.
If you don't know the details of a pack or cells, you can just use them however you want to, but they may not perform the way you want them to.