Nexus 5 running Android 6.0.1 This morning, the battery meter showing around 60% full, I spent about 20 minutes online when, suddenly, the screen went black. This has happened once before, and I suspected that the battery had gone flat - very suddenly! I plugged in the charger and booted the phone, then opened the battery meter which does indeed show a sudden complete drop to zero (image attached). This unit must now be over 3 years old, and I do realise that batteries don't last for ever. This sort of thing has only happened twice, although the battery does appear to drain more quickly once below 40% or 50%. Does this suggest that the battery is about to fail? If so, perhaps I should try to obtain a replacement battery, as everything else regarding the phone is absolutely fine. Thanks for reading, and I'd appreciate any advice.