Joyisi 48V 12.8AH Ebike Battery for 250W 500W 1000W Electric Bicycles Motor and Conversion Kit

I would have no problem recommending to buy this batteryPurchased this battery about 6 months+ ago at the time of this review.What matters here is how long can it keep you going before it needs to charge.I've not been able to precisely measure, but I know it's longer than the previous oem battery and it can take me between 22-28 miles on a full charge which is great.

seems like a good battery; lots of power distance, but not weather proof. Who leaves bike outside or rides in rain? bad ideaalso, doesn't fit bottle cage points. well, it does, but unless they are mounted high, like near the top of the tube, about 9" from the top, the position will be wrong

I have yet to properly full test the duration of the battery and it's longevity with my 500W-1000W motor.However I noticed the vibrations from the ride were causing the battery to disconnect ever so slightly from the base.It does need to be 100% snug in order for it to continue operation.Also the plastic on the base seemed a bit warped for some reason, and it wouldn't slide on or off very easily, it required both hands and a decent amount of force to get it to slide into position to properly connect to the base and also to remove it when it was not locked.The base also wasn't fully rigid, it had some flexion and bend to it, which per the other shoddy tolerances, seems is a requirement in order for the battery to sit and slide properly into position. (If you mount this, make sure the base attachment is fully flat and doesn't have any flex whatsoever, or the battery will not slide into the base correctly. And if it does slide in correctly, it will still be a very tight fit. Unless I received a defective Battery Case that is uniquely warped, however, I'd have my doubts).They should include an option to have the battery be mountable without the sliding base, so the cable from the battery base should be able to attach directly to the battery instead without the use of the Base/attachment.That way you could have the battery placed into a removable pack or pannier, and then you'd only have to disconnect the power cable to safely remove it and bring it with you inside (since it is not waterproof).The connection between the Base and the Battery is INSANELY tight/snug. I think something happened and it's warped from either heat or something else.It also seems like the sliding metal sliders for the base aren't 100% machined to the best dimensions, as they stick out slightly too much, and they have such minimal tolerances within the areas to place bolts, that you'd most likely have to shave any bolts down for it to not scrape against the plastic bottom of the battery itself. (Further complicating the battery base issues).They should include a Rain Cover or something as well with a hole for the battery cable, as again this is not waterproof.I may update this review, once I've been able to test it's batteries and longevity, however the base attachment being seemingly warped or having poor tolerances. (I took this to a professional bike shop as well, and they felt the same about the Battery fitting into the base*).

I was riding my e-bike with 27 pounds of 36v 12ah SLA batteries, 3x 12v 12ah. Then I upgraded to 18 pounds of 36V 20Ah Nimh cells 60x 1.2v 10ah. I'm so happy to finally have this 36V 15Ah Li-Ion 8 pound battery! Update 07/2021: I attached a B-Rad4 adapter to the down tube bottle cage mounting threads to move the battery mounting away from the seat tube. This can also be done by drilling into the down tube and installing M5x0.8 blind rivets.

I have had this for a year and a half and put over 1,000 miles on the bike since purchasing. I really only use it while I am also pedaling, but I am able to get 25 miles on a charge and top speed on flat ground is 20-23mph. Battery shows no signs of slowing down yet! Great purchase, highly recommend.

Product was non functional on arrival. Will not hold a charge. BUYER BEWARE: Amazon does not permit return/exchange of this product.

Battery works great gets me too and from work (about 16mi) no problem

Great battery