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  • CoMoBiker
    started a topic Tool batteries

    Tool batteries

    I wonder about the viability of using tool batteries on and e-bike. I'm looking at the Milwaukee M18v batteries with 9ah capacity. You can buy 4 of these from Home Depot for about $600. They are listed as 18 volts even up...would a 2s2p configuration give a solid 36v 18ah battery pack. I've been looking into 3d printing some mounts for this arrangement. One big advantage is that if one cell failed it would only need 1/4 of the battery replaced at about $150 rather than the whole thing at $600.

  • CoMoBiker
    replied
    Thanks, that article was very helpful. It makes me think a pair of Milwaukee 18vx12ah batteries in series might work fairly well. Two of these can be had for about $300 from Amazon.

    Leave a comment:


  • JPLabs
    replied
    Originally posted by CoMoBiker View Post
    Thanks, that article was very helpful. It makes me think a pair of Milwaukee 36vx12AH batteries in series might work fairly well. Two of these can be had for about $300 from Amazon.
    That's 864Wh for $300, wow! That is a low price of $0.34/Wh.

    A 52V GA 1248Wh triangle pack costs more like $800, or $0.64/Wh.

    So, the energy cost for those Milwaukee tool packs seems very good if they work well, and if 36V or 72V is OK.

    Leave a comment:


  • Robert62
    replied
    That's gonna be crazy!
    Robert

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  • calfee20
    replied
    I am building a battery for a Vector Typhoon and I decided to go the tool battery route. I bought 22 DeWalt DCB-206 batteries.

    Click image for larger version

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    I suppose I should start a thread.

    Leave a comment:


  • CoMoBiker
    replied
    Thanks, that article was very helpful. It makes me think a pair of Milwaukee 36vx12AH batteries in series might work fairly well. Two of these can be had for about $300 from Amazon.

    Leave a comment:


  • spinningmagnets
    replied
    I really like my EGO 14S mower and string-trimmer. It is marketed as "56V", but it is what ebikers call 52V. Here is an article that might be helpful...https://www.electricbike.com/cordles...ies-for-ebike/

    Leave a comment:


  • CoMoBiker
    replied
    That 80 dollar battery is 2.5 AH...I’d need to run 5 or more in parallel to get the kind of range I want. My current sla pack is 12 AH. I’ll probably end up buying a 36v 20AH lipo bike battery some day.

    Leave a comment:


  • john*thomas
    replied
    Originally posted by CoMoBiker View Post
    One thing that has made me look at alternative battery sources is that high quality 36v bike batteries seem to be getting in short supply. Several dealers are showing out of stock on brand name cell batteries in this size. Maybe the trade/tariff situation has put a damper on the supply situation or the end of year sales have depleted inventories. Maybe supplies will improve after the new year.
    I’m thinking too that 48v is eclipseing the 36v system as the US standard of choice...but I still think 36v is a good power level for a rider that wants to do a little peddling with the ride.
    You can get a complete 40 volt Lawnmower for $199. That's the battery I used on my 36 volt bike. I didn't measure how far it took me but if you are using it as a boost to peddling as not as full power you should be able to get a few miles out of it. You need to rig up a connector but that was pretty easy. A couple spade connectors and wire.

    https://www.lowes.com/pd/Kobalt-40-v...xoC-RIQAvD_BwE

    $80 for battery and with some looking you can likely find both cheaper.

    https://www.lowes.com/pd/Kobalt-40-v...RoCkWYQAvD_BwE

    Leave a comment:


  • CoMoBiker
    replied
    One thing that has made me look at alternative battery sources is that high quality 36v bike batteries seem to be getting in short supply. Several dealers are showing out of stock on brand name cell batteries in this size. Maybe the trade/tariff situation has put a damper on the supply situation or the end of year sales have depleted inventories. Maybe supplies will improve after the new year.
    I’m thinking too that 48v is eclipseing the 36v system as the US standard of choice...but I still think 36v is a good power level for a rider that wants to do a little peddling with the ride.

    Leave a comment:


  • Robert62
    replied
    I think it will work fine if you can make it financially competitive. 36v packs are not too expensive. You will have a slight inconvenience with multiple chargers or sequential charging. Go for it if you think the math works! I wonder what brand cells are in those?
    Robert

    Leave a comment:


  • JPLabs
    commented on 's reply
    I agree with both points. Tool batteries seem to state Max voltage, more is better marketing syndrome, I suppose. Ebikes use nominal. So, yeah, it's an even bigger difference.

    If possible, look inside the mower controller and see what voltage rating is listed on components like capacitors. Anything higher will be high risk, for sure.

  • CoMoBiker
    replied
    I’m thinking too that 18v Milwaukee batteries when doubled in series would be just 36 volts even while a lot of ebike batteries are rated 42 volts max and somewhere aroun 32 volts lower cutoff.
    Also, I’m thinking theft resistance might be a problem too since tool batteries are so easy to pop out and readily marketable.

    Leave a comment:


  • JPLabs
    replied
    Blade top speed is a concern on a mower. 50% more volts means 1.5x design speed, unless it is speed control with closed loop.. That's risky, could fail a blade.

    Leave a comment:


  • max_volt
    replied
    I starting running my 20v hedge trimmer on a 24 battery but I'm not sure a 50% boost in voltage would be good for the mower.

    Leave a comment:

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