Lithium batteries for skateboard
Hi,
I have a electric skateboard with a 600w motor, I am in need of new batteries, it has 3- 12v 10ah SLA batteries, I can but those for about $90.00, But I found a 36v 12ah lithium battery on Ebay for $309.00 total with shipping included, but it says up to 500w 400w recommended, Will they work good with a 600w motor, and will I gain any speed, or should I just use the SLA's,
Thank-You,
So the battery cut is measured in in amps, so I would need to find the amps that the motor draws at full throttle, right???
Yeah. A hint is 600 watts / 36 volts = ??? amps
I really don't know, I am just a guy that buys old junk scooters and fixes them, or build an electric skateboard out of them, Do I divide 600 by 36 ????
Hm, I was trying to educate by leaving an exercise for the reader ;-) ..
What I meant is that "watts" is volts times amps. For example your typical incandescent lightbulb is 120 volts and 100 watts. That means the bulb takes 0.83333 amps because 120v * 0.83333 amps = 100 watts.
You know the controller you have is rated for 600 watts, and the system runs at 36 volts. Hence 600/36 = 16.6666 amps is the peak current the battery pack will be asked for. This is assuming the rated power is actually the peak power.
Thank-You,
Now I know the formula, And will use it in the future, With your permission of coarse....
Hey Reikiman,
Sounds like you have a good electronics background, I have just enough to get myself in trouble. Maybe you can help me with with an issue. I just purchased an electric skateboard with 36 volt LiPo batteries. I was running it up a pretty steep hill and it started cutting out on me. I took it home and recharged it and when I went to turn the board on the next day, no power. I took the battery pack apart and I have a little over 40 volts at the battery pack and no voltage on the other side of the BMS. I can bypass the BMS with a jumper on the negative side with the charger hooked up and the batteries charge fine. When I reinstall the battery pack, install the charger and turn on the controller the board will run. When I remove the charger, the board dies. Is the BMS fried or is it locked up and can it be reset?
Thanks for any info you can provide me.
These batteries have a battery management board which cuts off the current if the discharge rate goes too high. I believe it's meant to protect the battery. For example the following specs are copied from pingbattery.com (36v15ah) and the important numbers to look at are "max continuous discharging amperage" and "discharging cut-off protection". These numbers will help you in comparing different batteries.
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