Hmm, UltraFire 4.2v 4200mAh Long Lasting Rechargeable Li-ion Battery, Model 18650
inexpensive protected 18650 battery
Features:
Easy to use and carry
High quality and durable
Rechargeable times: up to 1500 times
No memory effects
Low reoccurring operation cost.
Short-circuit and over current protection
Shelf-life around 10 years
Environmental friendly.
Capacity: 4200mAh
Voltage: 4.2V
Weight:0.09lbs
Return Policy
Satisfaction 30 days Return Policy:
Return for refund: 30 days from invoice day
Return for replacement: 30 days from invoice day
these are notoriously poor quality. at best maybe 500mah, probably recycled laptop batteries. also usually not protected even tho they claim "Short-circuit and over current protection" you have been warned.
also you can not return li-ion's so the warranty isnt worth the screen its written on