FOURSEVENS 16650 (2200mAh) Rechargeable Li-Ion:
WORKS WITH: Quark QK16L (and other legacy Quark Click/Pro/Tactical (also other 4.2V two cell lights). Does NOT work with the Quark Smart.)
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
Why did we discontinue the 2xCR123 platform?
Because we believe that running a light with 2x(R)CR123 is dangerous. Using two cells in series creates a significant chance of catastrophic failure if the batteries become imbalanced. Imbalance can be caused by batteries of different age, manufacturing defect, or difference in charge state. For example, you accidentally put in a charged battery with a discharged battery. This imbalance can lead to fire or explosion in one of the cells.
This is not uncommon. Even if you think you are diligent, why take the risk when a much better option is available? This is also why we are no longer shipping any Foursevens lights with 2xCR123 cells.
Theoretical Run Time Comparison @ 1A:
- Foursevens 16650 2200mAh = 3 hours
- 2xRCR123 750mAh = 2 hours (poor capacity & explosion risk)
- 2xCR123 1500mAh = 3 hours (good capacity but explosion risk)
This rechargeable 16650 battery has capacity equal to 2xCR123 cells and significantly more capacity than 2xRCR123 cells. The upcoming Quark QK2L 16650 will ship with this battery included, but we highly recommend using this battery in all of your two cell lights that are compatible with 4.2V.
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.
Size16650 (16.5mm x 69mm)
Terminal Type"Button Top"
Voltage3.7V Nominal (4.2V full charge)
Service Life~500 Cycles
Charge Retention80% @ 6 Months
Maximum Discharge4.4 Amps @ 2C
Electronic/Mechanical ProtectionOver charge, over discharge, over voltage, under voltage, short circuit
Where it's made