@ALPHA17
Your phone's battery is getting drained due to wakelocks. Install Better Battery Stats (available for free at XDA) in order to find the culprit behind these wakelocks. In my 1.5 years of using Whatsapp, I have never found it to be a battery drainer in deep sleep mode. Most common culprits behind wakelocks are RILJ (bad network signal) and Media Scanner.
Also, task killers on Android are useless and should never be used. It will only result in additional battery drain as the apps will keep restarting, thereby increasing processor cycles.
Mentioned already I DO NOT USE ANY APP KILLERS, I GO INTO THE SETTINGS AND KILL THE APP from there. WHATSAPP and a few game applications keep restarting their processes even after force kills.
Thanks for better battery stats link. Will have a dekho and report back. Cheerio!
Update Just checked it is a paid app. I do not have a credit cared =[.
Downloading XDA edition via QR code.
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