For 2116 and 2216 cabinets, if the battery is not charging or the RBS can’t run on battery when there’s no power at the site, it actually means two things:
1. There is a breaker panel on the topmost part of the BBS that controls the BFU. This panel has a numbered breakers on it starting from 1.We normally tap power from that panel and give it to the transmission equipment.Check if the 1st breaker is in the on position, if it’s not on just put it on and the battery from now onwards will charge and can sustain the site when power is off.
2. The BFU can internally have battery disconnect alarm without showing this alarm on the BFU.So when such a thing happens you just have to change the BFU.