Awhile back I adapted a ~40 volt Ryobi lawnmower battery to fit my
eBike. Seems to work perfectly.
I bought a "dead" Ryobi grass trimmer on eBay for about $20 that used
the large Ryobi battery. I dissected the trimmer and extracted the
"shoe" connector for the battery. Attached it to my eBike.
The Ryobi ~40 volt battery comes in several Amp-hour sizes, so you can
chose the size that suits your needs (and your budget.)
The Ryobi has a built-in BMS and you can (you _should_) use the stock
Ryobi charger. Ryobi has a sterling reputation and thus a bulletproof
BMS. The battery has under-voltage, over-voltage, over-temperature, and
short circuit protection. What more could you ask?
Bill D.
On 10/7/2025 3:59 AM, Peri Hartman via EV wrote:
I will second this statement:
I may be overly cautious, but I would be leery of batteries offered on
Alibaba, Ebay, and Amazon, unless you have a way to vet the
manufacturer.
In short, buy batteries from a company that will suffer direct and
substantial consequences if they sell faulty batteries. Buying direct
from a chinese supplier gives you zero recourse.
Peri
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