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Battery Pack mounting

Where to stash your battery packs for handlebar mounted lights is sometimes an issue.

Helmet mounted lights are not so much of a problem.
You can usually stash the battery in your Camel back pack or stick it in your jersey pocket.

Here's a couple ways that I stash my handlebar battery packs.
I have also seen seat post mounted battery packs on some commercial lights.
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The 4x18650 flat pack shown above Left gets stashed in a jersey pocket or my Camel back.
The 4x18650 square pack shown in the middle can go in a Camel back or into the green Hammer gel flask holder
The Hammer gel flask holder has large Velcro straps that can clamp to the top tube.
The 6x18650 pack on the right is inside a chopped down Hammer gel bottle.
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Another shot of the Hammer Gel flask holder on the top tube
With 4x18650 battery pack inside
6x18650 Battery pack in the water bottle cage
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This shot shows a 18650 battery pack inside a chopped up water bottle.
The white bottle is a Hammer gel bottle. It is the perfect size to fit inside the blue water bottle.
I made a foam surround piece that fits inside the water bottle and keeps the battery pack from banging around.
The bottom of the water bottle has a small round foam piece that the battery pack sits on.
I also have a foam cap that goes on top of the battery pack and keeps the mud from coming inside the opening and getting on the battery pack.
On the outside of the blue water bottle you can see a Velcro band that is stuck to the bottle.
This lets me wrap another piece of Velcro around the bottle cage to make sure the blue bottle does not fly out of the water bottle cage.
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