We supply free technology consultation about cell and battery pack assembly for the products we sold.

The service life of different lithium batteries:
The service life of Lithium ion 18650, 21700, 26650 battery is 2 years or 500-800 times cycle. 
The service life of Lithium ion prismatic battery is 3-5 years or 2000 times cycle. 
The service life of Lithium iron phosphate prismatic battery for electric vehicles application is 8-10 years or 2000-4000 times cycle. 
The service life of Lithium iron phosphate prismatic battery for energy storage application is 10-15 years or 3000-5000 times cycle.

According to these, Our warranty time and policy is differ from battery types and applications:
For Lithium ion and LiFePo4 cell, we supply one year warranty, make sure its voltage, internal resistance and capacity in promised range. Supply compensation or return for qualified one.
For Lithium ion battery pack, we supply one year warranty. If have cells broken in warranty time, we supply replace new one. If BMS not work normally, we supply replace BMS, parts and technology support for maintenance. 
For LiFePo4 battery pack of EV application, supply three years warranty. If cells or BMS not normally in warranty time, we supply replace new one and technology support for maintenance. 
For LiFePo4 ESS (Energy storage system) battery module, we supply five years warranty for new developed ESS battery module to let our customer be assured for our quality. And supply three years warranty for proven ESS battery module.