Roger that.
In October, 2014 and again in October, 2015 my wife and I took extended vacations. The only way I can describe it is that for 30+ days each trip I hammered my 1520 with everything I could throw at it. Web Search, Comm, Navigation, hundreds of photos snapped daily, translator duty, etc. You name it, I made the phone do it. That battery just lasts and lasts. There were 3 days, if I remember correctly, on that first trip that I resorted to a power bank. Those were looooong days in very scenic spots with far too many photo ops. The second trip we were using a vehicle so I was topping up regularly. But that first trip we would go all day and into the night. My wife would run through 2 batteries on her digital camera (brand new ones in great shape) and I took at least as many pics with my 1520.3, plus made it do everything else.
1520.3 never been off official.