Attention: Battery drain continues even with the latest version. Initially the problem started with version 17 i believe. I was hoping the latest version will fix it, but problem persists. I tested on diferent Andriod versions - 8 and 12, on different phones. In all cases when Viber is active, it becomes slowly the largest consumer of battery. I tested by removing the app and battery drain stops. Battery will last less than 1 day with viber otherwise ~ 2 days.