PCB are installed in the battery pack With short-circuit protection With over-temperature protection Plastic cases are made from imported high-impact ABS/PC materials Assembled with highest quality graded cells Ultrasonic technology guarantees the strength and reliability and ensures no break in drop test Every battery is scanned with our advanced X-ray machine to check the interior after ultrasonic process Undergone comprehensive testing including high altitude performance, vibration, mechanical shock, thermal cycling, external short-circuit test simulations Includes a 12-month free replacement warranty for manufacturer's defects