Battery advice

[Cavemann]

Hi, I'm building a two wheel drive (hub motors) mountain bike for off-road, from a Pinnacle Lithium 3 frame.
I've got the rims/motors, controllers, display and throttle etc. I just need a battery.
I'm planning for a 48v 15-20Ah battery to sit as low as possible between the down-tube and seat tube.
I've heard that the individual cell make/type can play a big part in how well suited the battery is to an ebike, but I've got no real understanding of this, and looking online I don't know how to tell where to buy a good quality one.
Can anyone advise a good pre-made battery that will work well for my project?

 

[HumanPerson]

Hey Welcome to the forums

 

[HumanPerson]

I've used quite a few different brands and for Me...it's these batteries that have been good to me in my twisted little mind LOL

BtrPower Ebike Battery Lithium ion LiFePo4 Battery Pack

ebike battery 36v 48v 52v 72v 60v lihium ion lifepo4 battery for electric bike scooter tricycle

www.btrpower.com

https://www.amazon.com/s?k=btrpower&crid=2FCD4J0TP40HM&sprefix=btrpower%2Caps%2C574&ref=nb_sb_ss_ts-doa-p_1_8

btrpower for sale | eBay

Get the best deals for btrpower at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items!

www.ebay.com

If it were me, and this is just my own opinion....
I'd go for something with at least 30ah on up to 45ah for a battery, but i like alot of saddle time

 

[Cavemann]

I've used quite a few different brands and for Me...it's these batteries that have been good to me in my twisted little mind LOL

BtrPower Ebike Battery Lithium ion LiFePo4 Battery Pack

ebike battery 36v 48v 52v 72v 60v lihium ion lifepo4 battery for electric bike scooter tricycle

www.btrpower.com

https://www.amazon.com/s?k=btrpower&crid=2FCD4J0TP40HM&sprefix=btrpower%2Caps%2C574&ref=nb_sb_ss_ts-doa-p_1_8

btrpower for sale | eBay

Get the best deals for btrpower at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items!

www.ebay.com

If it were me, and this is just my own opinion....
I'd go for something with at least 30ah on up to 45ah for a battery, but i like alot of saddle time

Thanks. I've checked in the UK but can't seem to find btrpower batteries here. Probably not worth getting them shipped over due to delivery charge...

 

[Cavemann]

I'm currently looking at the following:

https://www.amazon.co.uk/Battery-Lithium-Charger-Electric-Delivery/dp/B08SWM3Z6F?th=1

It claims to give 45A constant discharge, which is significantly more than I need, but good to have some overhead right.

Any advice pros/cons would be appreciated.

 

[KGC]

I've had two bafang batteries from aliexpress, no problems.

 

[smutboy]

I'm currently looking at the following:

https://www.amazon.co.uk/Battery-Lithium-Charger-Electric-Delivery/dp/B08SWM3Z6F?th=1

It claims to give 45A constant discharge, which is significantly more than I need, but good to have some overhead right.

Any advice pros/cons would be appreciated.

the constant discharge rate is different than the amount of total amp hours the battery can hold. The constant discharge rate is from the battery bms. and yes its better to have one that can let you get more power out of the battery whenever your motor needs bursts of power and also the higher the BMS constant discharge rate the less you will be maxing it out and causing it to fail. and its better to have a BMS that has a bigger output than you need as opposed to one that is underrated

also, the BMS and the quality along with what quality cells are in the battery pack is also important factor in a battery.

 

[Cavemann]

the constant discharge rate is different than the amount of total amp hours the battery can hold. The constant discharge rate is from the battery bms. and yes its better to have one that can let you get more power out of the battery whenever your motor needs bursts of power and also the higher the BMS constant discharge rate the less you will be maxing it out and causing it to fail. and its better to have a BMS that has a bigger output than you need as opposed to one that is underrated

also, the BMS and the quality along with what quality cells are in the battery pack is also important factor in a battery.

Thanks, good to know.

 

[James340]

I bought a UPP battery from AliExpress and it has been out standing.I got it with 21700 cells and it will deliver 1400 watts to the motor.That 35 mph on motor 40 pedaling.I only did that to find out what it was capable of