Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
regarding the con: on the anode it has 4 holes, where you can put a spring for putting the cells on series for diy.
fully compatible with many flashlights, etc...
mine came with 4.27v with 4.60amp.
don't have the bigger tip on the anode, being hard to use 2 cells on series, on diy projects (not really a con)
lasts half the time of a common 18650, but it is not a con, it is a disadvantage of the LiFePO4.
I had to built my own charger for these batteries, hard to find a cheap smart charger.
buy it ! can even replace two AA cells (on some devices that could use 3.6~3.2 instead of 2.6~3v)
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