Ryobi 40v's - What works and doesn't.

General Discussion about large electric scooters and motorcycles and other things with no pedals.
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Hyo   1 µW

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Ryobi 40v's - What works and doesn't.

Post by Hyo » Apr 08 2021 11:23am

Hey there! Newbie to Forums! I did a little research to see if anyone mentions any of this but I didn't see much yet.

So I've been experimenting with Ryobi 40v batteries in my Razor EcoSmart Metro scooter. It's a 36v 500w brushed motor scooter. Normally runs off of 3 12v 7ah SLA's that are heavy, slow to charge and lose power over time of the drive. With the SLA's I was getting max, about 8 miles in pretty flat terrain.

Enter my experiment with Ryobi! I was given a Brushless 40v mower, which came with the battery and charger. And I thought, heck, 40v isn't much higher than 36v, and there are people on youtube who have converted this particular scooter to 48v without much issue. Ripped out the SLA's, took apart an extra Ryobi 40v charger and used it as the interface for the battery to connect to the scooter.

It worked!... Sorta. As I found some others mentioning in the forums, People were using the 4ah and the 5ah batteries in their setups that ran 36v, and the batteries have a built in BMS that will trip if ya give the battery too much throttle from a stop. The fix for this? I found out you can parallel two batteries that are equally charged to double the power output! So off to the store I went to match the lawn mower with a weed whacker and a leaf blower too! Each come with their own 4ah batteries and a charger for 99 USD on sale during the summer. Cheaper than just a battery alone! (I'll never understand that...)

The two 4ah batteries, totaling 8ah would get me about 12.5 miles. The speed gets a boost at the start of the drive, from 16mph to 19mph for about 2.2 miles, then it tapers off back to 16mph, but for almost the whole rest of the drive. Even the scooters "dash" tells you when the batteries are getting low. Neat!

But wait! There's more!

I recently found a deal on eBay where a dude was selling Ryobi 40v 6ah batteries! And not just the little ones, but the kinda huge Ryobi "HP" 6ah 40v batteries. These are almost double the size of the normal 4ah or regular 6ah batteries. They were 70 USD a pop. Were labeled used, but working fine.

I bought 4. All charged and good to go! I plopped two into my setup, pulled the throttle and all good! The same, but hopefully more range! But I was curious! Can just one be used? I took one out. Leaving one plugged in. Pulled the throttle aaaand it works!

(Edit: I later found out on the test drive it will still need a second battery in parallel... The 6ah defo has more power, just still not quite enough.)

The Ryobi "HP" 6ah batteries can power my 500w scooter with just ONE battery! (Edit again: no it didn't...) This will help a lot because I had to raise the deck to accommodate the two smaller batteries before. Hah, I was going to need to raise it further, but with just one battery under the deck, I can actually put the deck all the way down! I will be taking these out for a test run later today to see how far they go compared to the old 2x4ah batteries.

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So anywho, TLDR:

Ryobi 40v 4ah batteries can push somewhere up to around 350-400watts before their BMS kicks in and shuts the party down.

Ryobi 40v 6ah "HP" batteries can push 500w+ ! The batteries need to say "HP" on them. I'm guessing it stands for High Power.
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The only unfortunate thing is, the 6ah HP batteries dont fit my lawn mower... But I did buy them just for my scooter so. Eh.

I know a lot of people find these batteries on ebay as scrap, but all they need is to be taken apart, rebalanced, and then they work again! These could be a super cheap way to go far! Mine were only 70USD a pop. I should be able to go 30 to 40 miles on these now. Too cool!
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All the batteries.
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Last edited by Hyo on Apr 08 2021 2:28pm, edited 1 time in total.

MorbidlyObeseKoala   1 W

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Re: Ryobi 40v's - What works and doesn't.

Post by MorbidlyObeseKoala » Apr 08 2021 12:29pm

Have you done the rebalancing effort on one of the "scrapped" Ryobi batteries?

Also could you share your connection method? Did you get a 3D printed part from ebay and wire them that way?

I ordered some of those scrapped batteries at a great price last year but a porch pirate made off with them. Out 50 bucks but the thief got junk that needed rebalancing so no good to him lol.

Hyo   1 µW

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Joined: Apr 08 2021 10:51am

Re: Ryobi 40v's - What works and doesn't.

Post by Hyo » Apr 08 2021 12:43pm

Update already. I was wrong sorta. Its weird. If I full throttle, sometimes it will cut out still with just one battery. Not while at take off, which is really weird. It will get to 5mph, and Sometimes cut out, other times it will hiccup then continue. Not sure. If I feather it just a little it goes just fine. Did 6.5 miles on one of the 4 batteries and it seems to be holding up pretty good! If you guys want I can post the link to these batteries. I plan to run them all down today to test their capacities individually. Even though they still cut out, they definitely have more oomf than the 4ah by themselves. However I will still be putting them in parallel. So much for fitting it all under the deck like stock. xD
MorbidlyObeseKoala wrote:
Apr 08 2021 12:29pm
Have you done the rebalancing effort on one of the "scrapped" Ryobi batteries?

Also could you share your connection method? Did you get a 3D printed part from ebay and wire them that way?

I ordered some of those scrapped batteries at a great price last year but a porch pirate made off with them. Out 50 bucks but the thief got junk that needed rebalancing so no good to him lol.


I have not done any rebalancing of Ryobi 40v batteries yet, thats the next project soon, but I have done it with the 18v ones. The newer 18v silver batteries seem to have a chip in them, that if any of the cells go below a certain point, the chip will permanently shut itself down. However almost all of the black and gray 18v batteries (Ones without the fuel gauge) if you rebalance the cells, it will come back to life. I've recovered about 10 batteries I got from home depot by just asking if I could have a battery or two to experiment with for free. It's hit or miss. Find the cool and chill manager, they will help ya out. I've tried Makita batteries as well, the 18v ones. I've had 4 recycled ones, and NONE of them will charge, even after you rebalance. Charger will just say defective.

Hyo   1 µW

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Joined: Apr 08 2021 10:51am

Re: Ryobi 40v's - What works and doesn't.

Post by Hyo » Apr 08 2021 2:14pm

Another update. I was able to drive only one of the batteries down to nothing.

Nothing meaning the low battery light was coming on and the speed was dropping quickly from 16mph down to 12mph in just a quarter mile.

To remind, two 40v 4ah batteries, totalling 8ah, that are brand new, in parralel did 12.5 miles just the other day.

Today just one 40v 6ah "HP" battery did 10 miles. By itself. These are used! I'm not sure how that equals out, but it did it!

Same course as the other day! A long 4 mile road with stop lights here and there. Back and forth.

I was feathering the throttle though, because of the BMS issue that... I thought wasn't a thing anymore. Maybe being nice on the throttle really does make a huge difference in distance. Maybe I should be nicer to the throttle and the battery. Iunno.
battery 1.jpg
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