Characteristics of lithium iron phosphate battery（LiFePo4 battery）:
1. The life of LiFePo4 battery is longer, and the cycle life is more than 2000 times.
2. Safe to use, LiFePo4 battery is safer than 18650 lithium ion battery.
3. Fast charging. Using a special charger, the battery can be fully charged after charging at 1.5C for 40 minutes.
4. The LiFePo4 battery can withstand high temperature, and the hot air value of the LiFePo4 battery can reach 350 to 500 degrees Celsius.
5. Lithium iron phosphate battery has no memory effect.
6. The energy density of the lithium iron phosphate battery is low, under same capacity, the battery volume is larger.
7. The price is expensive. The lithium iron phosphate battery is more expensive than the 18650 lithium ion battery.
8. Low battery voltage and poor low temperature performance.

Common 18650 batteries are divided into lithium ion batteries and lithium iron phosphate batteries. Lithium-ion battery voltage is nominal voltage 3.7v, charge cut-off voltage 4.2v, lithium
iron phosphate battery nominal voltage is 3.2V, charge cut-off voltage is 3.6v, capacity is usually 1200mAh-3350mAh, common capacity is 2200mAh-2600mAh .
18650 lithium ion battery features:
1. Large capacity, the capacity of 18650 lithium battery is generally between 1200mah ~ 3600mah, and the general battery capacity is only about 800mah, if 18650 lithium ion battery is
combined to form 18650 lithium ion battery pack, then 18650 lithium ion battery pack can be any Break through 5000mah.
2. High voltage, the voltage of 18650 lithium ion battery is generally 3.6V, 3.8V and 4.2V, which is much higher than the 1.2V voltage of nickel-cadmium and nickel-hydrogen batteries.
3. High energy density, under same capacity, the volume of the battery is smaller than that of lithium iron phosphate
4. Low temperature performance is better than lithium iron phosphate.
5. The cycle life is shorter than that of lithium iron phosphate battery, and the cycle life of 18650 lithium ion battery reaches 800 - 1000 times.
6. The safety performance is lower than that of lithium iron phosphate battery.

Inbuilt Lithium iron phosphate battery ( LiFePo4 battery) -  1000W portable solar generator 

Inbuilt 18650 lithium ion battery (NCM lithium battery) -  500W portable solar generator