These are KeepPower manufactured, SNR Industry branded 18650 3500mAh Protected Button Top Batteries which come in a pack of two.

Specifications:
Nominal Capacity: 3500 mAh
Nominal Voltage: 3.7V
Discharge End Voltage: 2.5V
Max. Continuous Discharging Current: 8A

Dimensions:
68.90mm (L) x 18.60 mm (D)

Protection Circuit (Over charge, over discharge, over current, and short-circuit)

Warnings:
-Do not overdischarge/overcharge
-Recharge drained batteries ASAP
-Do not short circuit
-Do not dispose of in fire
-Do not expose to extreme heat or water
-Please be familiar with handling lithium-ion batteries before purchase.

Please note: Due to the nature of this consumable product, no returns are allowed unless the product is defective upon receipt.Protected batteries are longer than unprotected batteries due to the addition of the protection circuit. Please keep in mind we cannot accept returns on batteries.