Help - what kind of battery should I buy for my ebike?

[ray.michaelyy]

Hi everyone, I recently picked up this ebike conversion kit from Amazon - (Link Removed - No Longer Exists) In short, the motor specs are: 48v / 1000w / 470rpm. I am wondering if I would be able to use a 48v 12Ah 350W lithium ion battery such as this one - (Link Removed - No Longer Exists) to power the kit on road, or if it would just get damaged and/or burned by the motor. If not, what would be some options for batteries that are compatible with my motor?

 

[rich c]

What amperage is the controller rated at? Unfortunately, this kit doesn't have a display or pedal assist, so the throttle is the only way to use the motor.

 

[Bruce Arnold]

The battery will be fine. You have a 48 volt battery and a 48 volt motor. I don't know why they say 350 W because batteries aren't rated in watts. Watt-hours, yes, and this one would have 576 Wh. So I have no idea what the 350 watts is supposed to mean.

That being said, I'd be more likely to go with this battery or something similar. It's not that much more money, but it has 960 Wh instead of 576. That will either allow you to ride farther, or charge a lot less often (which is good for battery longevity.)

 

[rich c]

You know, that battery looks like it needs a cradle that isn't included. No charger either. I also see no wires coming out of it, so must be some kind of pins or sliding connector. That means you need a wiring diagram. It also doesn't mention cell manufacturer. I'd suggest you buy from some American importer instead of directly from China. For any problems, direct to China can be incredibly difficult.

 

[ray.michaelyy]

The battery will be fine. You have a 48 volt battery and a 48 volt motor. I don't know why they say 350 W because batteries aren't rated in watts. Watt-hours, yes, and this one would have 576 Wh. So I have no idea what the 350 watts is supposed to mean.

That being said, I'd be more likely to go with this battery or something similar. It's not that much more money, but it has 960 Wh instead of 576. That will either allow you to ride farther, or charge a lot less often (which is good for battery longevity.)

Would a higher Ah also increase the overall speed of the bike? Or only allow me to ride farther?

 

[harryS]

Speed of the bike is generally determined by voltage.

Higher AH increases range. However it will still give better performance because acceleration demands high current and smaller batteries will sag in voltage when that happens. This becomes more noticeable as the battery gets used up.

The operating range of your 48 volt battery ranges from 54.6V fully charged to as low as 42 volts when it is shut down by the controller. You'll find performance and top speed much less under 47 volts when the battery is only half charged.

In general then, a bigger battery with more AH will let you ride your bike longer at max speed. I don't think you would be happy with the 13AH battery if you're going to zip along anywhere near the top speed of that motor.

 

[Jayson]

I think a 52V battery would be prefect,if a 48V motor with 48V battery can go 38km/h,a 48V motor with 52V battery can go 42-45km/h.There would be no damage for the motor,but will run more fast and more power.Further more if you want to run longer a 14ah-17ah would be a good choice FYI.

 

[Big Tom]

The battery will be fine. You have a 48 volt battery and a 48 volt motor. I don't know why they say 350 W because batteries aren't rated in watts. Watt-hours, yes, and this one would have 576 Wh. So I have no idea what the 350 watts is supposed to mean.

That being said, I'd be more likely to go with this battery or something similar. It's not that much more money, but it has 960 Wh instead of 576. That will either allow you to ride farther, or charge a lot less often (which is good for battery longevity.)

The BMS boards on the batteries control how much power the motor can draw. While the motor will run, it will just run like it was - in this case - a 350 watt motor. Because that's all the power the BMS will allow it to draw out of the battery.