Good evening. On the Internet many videos as exploding lithium ion batteries, of course after watching these videos, now nervously glancing at your powerbank xiaomi v2 with caution. There are 20 thousand capacity, not a tiny little bomb. The essence of the question of how to determine the health of the battery? In loss of capacity? And what swell or lose their shape of the battery? I see a little inflation at the center of the body, a few 1-2mm, XS it was so or I'm paranoid)) long Charge normal charge-2A, from QC refused. To refuse to use poverbank can't convenient. What protective mechanisms should be present?) Thanks in advance for the answers.