Anybody experienced battery sudden death issue?
It happened a few times on my nexus 4, whereby there's still around 20-30% of battery, while I was using it, the phone went off and I couldn't power it on again. Connect to charger, power on the phone and the battery became 0%

Quickly launch battery analyser app, it shows that it should last at least 2-3 hours before the battery deplete. Weird.

I would like to get the battery replace at service center, but wondering how should I proof/demo this problem to them? It happens randomly. And will it destroy my back screen protector if send in for battery replacement? Since they need to open the back cover.

why said so?
care to elaborate a bit more?