After flashing 20140418 I experienced similar battery problems at least shared with other 3 people. Essentially my battery wasn't able to charge up to 100% (stuck at 85%), and was completely drained in 3 hours. While I have been unable to trace the source of the problem (no 1ghz bug, didn't use OTG, battery was being drained without wifi/data, etc), I solved it doing the following procedure:
- Charging up to the maximum possible (first time was 85%, second 94%, third finally 100%), with the phone powered down. Check that your wifi is off before shutting down your phone. This can take more than a night (second charge up to 94% took me 14 hours).
- Drain your battery without data/wifi. I used benchmarks/screen-on to drain the battery faster.
- Repeat the process.
Hope this is useful for someone. Sorry in advance to mods in case this is wrong placed here.