I am very happy with Ryobi batteries and tools, so that is what I
adapted to my eBike. The Ryobi batteries seem to last quite some time. I
have perhaps 40 tools and perhaps 15 batteries, and I can only recall
perhaps two or three battery failures over the 15? years I have used
them. (The NiMH packs that were in use ~20 years ago would indeed wear
out and die after a couple of years, but the lithium packs seem to work
nearly forever.) Zero tool failures, but I am probably easy on power tools.
Thus, I strongly suspect that the internal BMS does some cell
balancing. The packs wouldn't last very long if they did not do any
balancing. Not terribly expensive to implement compared to the big
transistors required for the over-current/under-voltage disconnect.
I used the ~40 volt lawn mower battery without modification. We
pressure-washed it off when it was covered with salt-flat salt and that
ruined the battery as it filled with saturated salt water. 😳 The 40
volt batteries can are designed to put out far more than the 18 volt
batteries. Thus, the internal disconnect for over-current, over-temp,
and low voltage wasn't touched. The eBike loved the 40 volt Ryobi as it
arrived out of the box without alterations.
Bill D.
On 10/8/2025 2:46 AM, Peri Hartman via EV wrote:
That's a great idea ! It seems it would hold true for all the portable
tools, milwaukee, makita, dewalt, ... Or, is the form factor of the
ryobi lawnmower better for an e-bike ?
Peri
<< Annoyed by leaf blowers ? https://quietcleanseattle.org/ >>
------ Original Message ------
From: "Bill Dube via EV" <[email protected]>
To: [email protected]
Cc: "Bill Dube" <[email protected]>
Sent: 06-Oct-25 22:51:26
Subject: [EVDL] Ryobi-powered eBike (was: Batteries for eBike)
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.
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