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I eventually just used one of those cheap £8 external USB battery chargers.
I didn't need it most days, the Moto X (2nd ed) battery was good enough. But I was glad I had it for those times I did need it.
Part of my motivation for getting the Nexus 6p was the larger battery. It's huge, and I barely drain half before a day is done, even with things like VPNs running constantly (encryption takes CPU cycles, which uses battery).
I had one until I dropped and smashed it. I had dropped it many times, and wasn't using any case or protector... any phone would've died.
I loved it, and my only complaints would be that the battery sometimes didn't make the whole day (top-ups were essential), and that towards the end I was getting close to the storage limit.