Ryobi 40v powered e-bike

Ryobi 40v powered e-bike

I am now powering my e-bike with 2 of these batteries. Mind you these batteries are not new and are the smaller 2.5Ah. I spent $6 US for my batteries, but with shipping and brokerage fees(forgot about that one when I ordered!) I figure I spent $17 CAD. So for $34 CAD and a couple more bucks for wire and connectors I have a decent battery pack for $40 CAD! I think If I used 2 new 5Ah batteries it would be very comparable to the battery I purchased for my bike but for hundreds less! I use XT60 connectors soldered to the main terminals and made a y connector with 2 XT60 connectors going to a XT90 connector to match my e-bike. I do plan on making a mount system so I can slide the batteries in and then connect the connectors.

The motor on my bike is a Pro 902 250w 36v(works on 40v). I bought the motor thinking I just wanted assistance with getting up to speed from a stop and it works great for that. if you want a cruising motor(one where you don’t have to pedal at all) this one will work but I would recommend at least a 500w motor to give you more performance. i was happy with the motor until I purchased a 500w motor for my wife, and now she is way ahead of me without any effort.

Link to Battery Hookup: https://www.batteryhookup.com/?rfsn=4057226.686605

amazon.com link to mid drive you can power with these batteries: https://amzn.to/2ZyNk8Q
amazon.com link to inexpensive motor(make sure you grab 36v version!): https://amzn.to/2Fu5eTg
amazon link to similar motor to mine(possibly better) 500w: https://amzn.to/35E7j9U

amazon.com link to ryobi dock so you dont have to solder to the battery: https://amzn.to/3jAnJ72

amazon.com link to xt60 adaptors: https://amzn.to/2DhOe1C

amazon.com link to xt60 with wires attached already: https://amzn.to/34TgC5N

amazon.com link to power supply I use: https://amzn.to/3hXIysX
amazon.com link for similar power supply: https://amzn.to/3ir1BMv

link to my other e-bike video: https://youtu.be/VOfKGH66Wa4

the above links help me get paid(hopefully) and will encourage me to make more videos.

Thank You.

Readers Comments (10)

  1. One thing that I noticed when paralleling these 40v batteries is that one will take much more of the current than the other. They never discharge at equal rates. It’s better to just run off one battery, then when that one dies, just run off the second battery. The BMS on these batteries probably has something to do with it. I tried running two ryobi 40v batteries off my modded razor scooter and one battery (with exact wire lengths as the other) would always discharge much faster than the other.

  2. Black +, are you positive you want to do that? The electrons will get confused:) I have to admit I often catch myself following AC colour coding on DC as well.

  3. So this will not work in the long run. Here is why. Say you have an 40 V motor and 250W is needed. You are powering from two 95W batteries. You will be short 60W of power necessary to keep the motor running at its optimal or max speed. Motors require a high current at start up, although some do have soft start options. Even though this may be the case you need to verify with your specific motor. Obviously this will not meet the requirements for your bike at 250W. It may work but you will run your batteries into the ground and they will not last for very long. You need extra headroom on your battery so you do not deplete the charge too far or you will destroy the cells in the battery. The circuit board on these has a sense resistor to determine the current that the battery can supply. If it goes over the battery goes into shutdown mode and you will be stuck with you and your bike in the middle of wherever. The cells can supply a max of 30A peak each. With that pack you have 10 S 2P. If you deplete the pack the sense resistor will continue drawing the battery down too far and destroy the cells. How do I know this. Well i have at least one failed pack from the Ryobi Chainsaw. The OP4015 draws dawn fairly quick and the chainsaw is setup similar to an e-bike.
    The OP4025 runs a bit longer but the batteries still overheat, there is not enough airflow… Even though you have two packs, the motor is requiring more than the battery can put out and your batteries will overheat and then deplete and be not recoverable, this is how the OP4015 died. Good Luck man, but i think you need a custom pack for your motor, specific to the application that you are designing it for.

  4. having to modify the battery ruins this for me. I want to take my chainsaw battery and use it for a bike and still use it on my chainsaw afterwards.

  5. U know it’s gonna be a good video when he breaks out the soldering gun

  6. Old Engineer Guy January 10, 2021 @ 11:24 pm

    Just FYI, you can buy adapters for these batteries: https://www.amazon.com/gp/product/B07J17Z42R/ref=crt_ewc_title_huc_1?ie=UTF8&psc=1&smid=A1HWXZJ0PAYZR7
    Also, when soldering in close proximity to your heat shrink, you can wrap a damp piece of paper towel around the heat shrink to help reduce premature shrinking. Nice video, thanks!

  7. francisco gonzales January 10, 2021 @ 11:24 pm

    I tried using this method on only one battery for a 1000 watt hub… it works for a second and then shows low battery and shuts off even tho battery is fully charged…. any advice?

  8. You have my interest on this project! By chance did these batteries come from battery hookup or another source?

  9. Not sure if you know this but you can buy 3D printed docks from eBay and request the wire gauge you need . You would be able to remove your battery and charge theme on a ryobi charger . I bought 5 ryobi string trimmers from Craigslist’s for 20 bucks and cut the battery Mount and I used them on my ebike . I use the 5ah and 2.6ah battery it works great . Ryobi just released a 7.5 ah battery and once the price goes down on those I can’t wait to try it.

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