I recently bought a Buffalo A3. It has a defective battery so it only last about 2 km. Its a 22V 4.4Ah battery. I am looking for a new one and found an interesting 6s5p on aliexpress.
I am thinking it should be an easy switch. I’ll have to come up with a new enclosure but I have a 3d printer so that wont be much of an issue. The only downside to this battery is probably the way the cells are positioned, making it very bulky. But it will fit the board. I just want to make sure it will work.
It’s not too big. I can make it work:)
Not having enough output might be a problem though. On the website it says
The maximum peak current: 36A
Maximum operating current: 18A
Is that too weak? It is advertised as an electric bike battery so it should work right?
I looked it up. If we take this one for example:
That should get me a max output of 5.0 x 50 = 250A.
Is that correct? For higher than the ali express battery
Ok, lets do the math…
Buffalo A3 has 1200W motor running on 22.2V battery…that means it needs 1200W / 22.2V = 54 A of pea current They LiPo you have linked is okay you can choose LiPo with lower discharge rating…5AH 20C battery would do the work easily ALso I would rather buy 2 3s lipos and connect them in series to make the build less bulky, but thats up to you
Where are you from?
Thanks, i didn’t realise how to calculate what I need:) I will look into Lipos som more. But if I get that I would need a charger as well right? Or maybe BMS if I want one port charging?
I am from Sweden:)
The charging port is in the bottom left of the picture and the battery connects to the electronics on the other end. Do you mean that the bms is build in along with the electronics? Because if thats true then the bms is on the opposite side from the charger. I thought it had to be between the battery and the charger?
Anyway I found some LiPos I like.
This one is the most interesting:
And possibly a charger if I cant figure out how to use the one I have
How would a 6S5P not give out enough amps? If 30Q cells are used (which are rated safely to 20A continuous) then that’s 100A or 75A if you take the 15A discharge rating.
I get that his pack is low voltage at 6S but surely 5P would have ample current?
Ah I misread and thought you were thinking to make your own pack.
Yeah I’m sceptical of ‘Big brand 18650 cells . Good quality!’ Stick with a lipo I’d say, you’d definitely need a balance charger if you don’t have one already.
The battery pack you have has build in BMS probably…you are connecting just the two wires to the charger when you are charging am I right?
The charger you linked will be ok Imax is comonly used by builders
Yes, it is possible to get BMS for the lipo they are quite cheap you would use the lapop style charger you alredy have You just need to solve the proper wiring to the BMS, some basic soldering (charging cable to BMS) will be probably needed
If you plug it into a laptop style charger then it has BMS build inside the battery pack
Its 7s as you said, that could be a problem…I didnt find any discharge specs, try asking their support…but I wouldnt buy that, the higher voltage could destroy your board…
