Smart lock with decent battery life?

[Trent Reeve]

I bought my first property in late October and have been going through remodel. I put on a Kwikset Halo which had been working great until about a week ago. I now constantly see "jammed" on the app when it is locked fine. research says that can happen as battery drains (its at 55%).  I didnt get the lithium batteries, so that may help. And I may just have to have the cleaners change the batteries monthly.

what are people's experience with other WIFI smart locks like Schlage Encode? how long do batteries last? 

also, any recommendations for a key-lock box as backup if the smartlock fails? this is a townhome, so hiding spaces are a little limited.