FOURSEVENS 18650 (3400mAh) Rechargeable Li-Ion:
WORKS WITH: Prometheus Alpha (and other 18650 lights that accept a protected cell)
We finally made the leap and now have our own customized batteries! As you know, I'm obsessed with quality and these li-ion cells are top of class and are guaranteed to deliver.
What you get for your money:
Reliability: Less chance the cell stops working for no apparent reason (it happens)
Consistency: Every battery has similar performance (as opposed to variable)
Safety: Mechanical and electronic safety features (a "protected" cell)
Lifetime: Longer total life span because of the characteristics above
Recharge early and often!
Do not run rechargeable batteries until they are completely empty (when the light shuts off on its own). Doing so will trip the protection circuit and render the battery inoperable. The Foursevens Flex Charger and Xtar VC2/VC4 chargers are normally able to reactivate a tripped battery; however, best practice is to recharge early and often. Fully discharging the battery causes long term damage to the cell.
ALWAYS store batteries in a protective case that will prevent short circuits. NEVER put bare cells into a pocket, bag, or drawer. A short circuit will lead to an uncontrolled release of energy...otherwise known as a ball of molten lava.
We ALWAYS recommend the use of "protected" batteries, excluding special circumstances.
Size18650 (18.75mm x 69mm)
Terminal Type"Button Top"
Voltage3.7V Nominal (4.2V full charge)
Service Life~500 Cycles
Charge Retention80% @ 6 Months
Maximum Discharge7 Amps @ 2C
Electronic/Mechanical ProtectionOver charge, over discharge, over voltage, under voltage, short circuit
Where it's made