DIY Battery Build
So I am designing a DIY battery for my TC. I am using 26650 (5000mah) cells and have designed a 17s6p battery that fits perfectly into the original space. It will be a 60v30ah unit, same as the original. Should hopefully cost about £500.
Currently waiting on the cells from china plus the battery welder. Watch this space for updates 🙂
Building your own battery seems serious, have you done any earlier?
£500, thats about €560?, then you need a BMS, how do you think about the case design, aluminium as original?
I have a pair of electric trial motorcycles wich now is equipped with china-built batteries for the nearly the same money, I looking for sellers who offer Samsung / LG / Panasonic original cells.
What is the reason to build your own battery, mostly because you can or do you want certain characteristics?
without original bms you will always see blinking 0% SOC on display
I’m going to connect it in parallel with the original battery so as to keep the overal % reading. Basically using an xt60 Y lead. Im also going to swap the horrible ‘melty’ connector ?
Ive built smaller batteries before and like having a winter project! Also I will be saving money too. I’ve found a BMS with Bluetooth/app which can handle the current draw of the Soco.
Im still yet to work out the casing... wanna make sure it works first! I’ve been learning from this bloke:
Sad thing is his ebike is a lot faster than our SOCO ?
Batteries and BMS have arrived. Ive put together the first 9s to test the BMS.
Works very well and has an app (that actually works!!) to monitor the cell voltages and temps etc. Much better than the Super Soco's BMS.
Next step is build the next 8 sells, attach the BMS properly, wrap in Kapton tape/neoprene (padding) and finally heat shrink.
(-30 temp on the app because i haven't attached the thermistors yet)
So the battery is almost finished! Ive managed to have a test ride and it all works as expected. I was able to travel 52 miles and arrived home with 30% battery. Not bad.
However, I did have a few issues. It seems when plugging in another battery, the bike can sometimes go into 'charge/regen mode' randomly. I think this is to do with both batteries trying to level off. This is not great though as it leaves you at the side of the road in charge mode until it recovers ?
Solution at the moment is to unplug the data line from the original battery. This cures the problem but leaves you with the 0% flashing battery indicator. Again, this isn't a problem as I have an app to monitor the overall battery state.
Would like to be able to fix this issue but I fear the BMS in the soco battery is to blame ? Unless people know otherwise?
Now just have to cover in giant heat shrink.
Total cost about £550 including the battery welder which I can use again etc!