I hav been using whatsapp for a quite long time and have realized that its this which makes me run for my charger everytime.
It exceeded the limits this morning, wen I woke up I found my fone laying dead due to low battery... Mind it, it was at 38 percent 6 hours back i.e wen I went to sleep...!!!
Buddy --- I suppose u r an India--- vodafones network is pathetic here in mumbai.. once the app drops the connections its then really very hard to get it back online...it just stucks and keeps on updating itself till eternity.