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I stock many of the parts used in these Bike lighting projects, on my web store.
Here is the link to my web store page with bike lighting and P7 LED parts.
Click here to go to my web store

Click here to go back to the Main Bike lights page

Converting a Dual Li-On charger to charge 18650 battery packs
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This dual charger is a dual 18650 Lithium Ion charger. It can charge two single 18650 batteries independently.
It has a green and a red Led on each charger half that indicates when it is charging (Red) and when it is done charging (Green).

In the photo above, you can see that I have converted this charger to also charge 18650 battery packs.
I am charging a single 18650 3.6 volt 2400ma battery on the right charger and a 3x18650 battery pack on the left charger.
Note that the 18650 batteries in my LED bike light packs are all soldered together in parallel.
So you still have a 3.6 volt Li-On pack, you just add up the mah hours to get more burn time.
In the battery pack above, there are 3x18650 3.6 volt 2400 mah Li-On's.
This pack is now has a 7200 mah capacity.

I use Anderson PowerPole connectors for my lights chargers and battery packs.
I have more about that on that on my main bike light page.

The specs on this charger are:
Input: 100-240vac 50/60hz at 500ma max
Output: 4.2vdc at 1Amp for each charger
 
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Here's a shot with the back cover off.
Note this picture shows SAE connectors, I have converted this charger to use Anderson PowerPole connectors
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You can see I have noted where the plus and the minus are for each charger.
I soldered a connector to the plus and minus of each charger and then the connectors exit the charger on each side so that I can tell which connector goes to which charger.
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Back Cover
I used a small wood rasp bit in a Dremel tool to create wire exit points in the rear cover.
It takes about 2 seconds to do this and you have to be careful not to melt the plastic too much.
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