See this product in video click on the following link: https://youtu.be/Kvk84YC7-TU

rechargeable 3.7V 4.2V 800mAh Real capacity 18650 battery cell Megatronics
Lithium-ion batteries have revolutionized portable devices. They’re in everything, from our smartphones and cameras to baby monitors, fitness gadgets, and flashlights.
As battery technology has matured, cells that were once reserved for device manufacturers have found their way into consumer hands. However, these new lithium cells have not been standardized quite like the rechargeable AA`s.
An 18650 battery is a cell that’s 18mm x 65mm in size. The name refers exclusively to the size of the lithium-ion cell, but there can be minor variations even here. The 18650 has become the new gold standard for replaceable and rechargeable batteries.
They offer the performance of a lithium-ion cell, a capacity in the range of 800mAh to around 3500mAh, and an output of 3.7 volts. They’re used in a huge range of devices from laptops to laser pointers, and camera accessories like gimbals and sliders and power bank.


Features:
Brand: Megatronics.pk
3.7V 18650 sizes Cylindrical Li-Ion Cell
No memory effect and longer storage life than NiMH Batteries
Lighter weight and higher energy density than any other rechargeable battery
It is excellent to use as standard for text battery analyzer, used in DIY projects and power banks.


Nominal Voltage:  Average 3.7V
Nominal  Capacity: 800mAh
Max. Charging current  2.6A max.
Max. Discharging current: 5.2A max.
Dimensions  Diameter 18.3 mm (Max 18.4), Height: 64.9 mm (Max 65.1)
Weight  40 g
Internal Impedance             Internal Impedance: less or equal to 90 mirco-ohm (with PTC)
Cycle Performance  80% of initial capacity at 300 cycles


Cautions
Li-Ion Batteries may explode if charged or discharged improperly.
You must possess knowledge of electronic and understand how to handle Li-ion battery. 
We reserve the right not to sell and void the warranty it you don't meet the above statement.
You must use a protection IC (PCB) to keep battery from being overcharged and over-discharged
Never solder directly onto the Li-ion battery as overheat might cause the battery to explode. If you are making a pack or need to solder batteries together, you need to get the battery with tabs on it. You will solder to tabs instead directly onto the battery.


Optional 
For DIY, you may add tabs as an option at a little extra cost
You may choose our smart balance charger to charge single 18650 cells
4.2V/cell overcharge protection
2.5V/cell over-discharge protection
Max current over-drain protection
Short circuit protection.