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  1. #1
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    Want bottle shaped battery pack for 2 china lights

    Sorry if this is a noob question but i currently have 2 solar storm light off of eBay. they work well enough and have been solid performers for 1 season. What i do have issues with is the batteries. they work great in the summer but in the winter they fade much faster. Also they attach to the bike via the little velcro pouch. what i would like is for a battery pack that i can mount in the bottle cage and also have 2 outputs so i can use the one battery pack for the two lights.

    Does something like this exists and what cells should i use? the lights are 8.4v lights.

    thanks in advance

  2. #2
    Drinkin' the 29er KoolAid
    Reputation: kwarwick's Avatar
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    There are no commercial 7.2V bottle batteries, as far as I know, but you can make your own pretty easily. Start with something like this: PRO Bike Tool Tube Bottle Stash Storage Container Water 750ml bike tools can | eBay

    Find a 2S LiPo pack that will fit inside with a little extra space. Wrap LiPo with foam to make it a snug fit. Make a hole in top cover to run your power wires through... use a waterproof gland for the wire (select one with the correct diameter for the wire) 5 pcs Black Plastic Waterproof Cable Gland AD | eBay

  3. #3

  4. #4
    Drinkin' the 29er KoolAid
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    [QUOTE=scar;12923804]Water Bottle Battery: Li-Ion 7.4V 10.4Ah (79.96wh) with Trail-Tech female plug + 1.2A UL listed Smart Charger for HID / Halogen Bikelight[/QUOTE


    Oh yeah, I forgot about them, although not really DIY solution...

    I like that they've added some safety features like the resettable fuses.

  5. #5
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    A cable gland will give a pro finish. Just cut off the spout off a regular bottle and screw it on. You also have the advantage of using one of the smaller cheap bottles too.


    8 PCS PG7 Black Plastic Waterproof Cable Gland Connector 3-6.5mm CP

  6. #6
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    Thank you everyone for the responses. This will give me a great place to start

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