I am most familiar with the
Tenergy LiFePO4 RCR123A 3.0V 750mAh
and the
Tenergy Li-Ion RCR123A 3.0V 900mAh
Since they are both 16340, they are
approximately the same size (16mm diameter, 34mm long). Since the Li-Ion battery has PCB protection, it may be longer than the LiFePO4. This LiFePO4 battery is considered "protected" because of its much safer chemistry; it does not have PCB protection. [NOTE: These two
batteries should
not be used together or in each others charger.]
The
LiFeP04 3.2V 1000mah 16340 battery that EastMall sells for use in its Indulgence is yet another battery, about which I know nothing. That "3.2V" probably means its "working voltage" (which is the same as the two "3.0V"
batteries). EastMall states that it does have the additional PCB protection.
I do not know the
precise size of any of these batteries. Since EastMall sells this last battery and says that it is "specially made for Indulgence," that one is the surest way to go.