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Lol, nobody is online its so late. Whats the best way to get 2 batteries into a host that accepts 1 22650? Ive been using CR123a's but I don't like having so much extra room.
bhwollen this link will not help on this particular quest, but it might help in the future. AFAIK there is not a LI-ION battery that is very close to your requirement. You can make a sleeve out of PVC to take up most of the extra room in the host.
List of battery sizes - Wikipedia, the free encyclopedia
The code for LI-ION batteries is this.
22650 = 22mm x 65mm with a zero on the end. Diameter x length in mm
AFAIK all li-ion use this formula except for the CR123