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I don't know about a quicker draining battery, but they seem to have messed up fast charge when connected to my PC. This worked fine before the update, which I installed yesterday. I placed my phone on my desk, connected to my PC, like I do every night, to wake up this morning and find it has only charged up to 76%.
You guys should reinstall the system, clean install with a fulll wipe.
Im on 10.3.1.0 after bad battery drain, full wipe and reinstall to 3.1.0 again and its realy realy good.
I used XiaoMiTool to reinstall, worked like a charm!