Check out the Moto E4 Plus. Longer battery life and a little better overall performance than my Moto E4, which I've used since December. Both have user replaceable batteries. Decent phones in the low-middle price range. Only 16 GB, but accepts a micro SD card and some apps can be stored on the SD card.

Go for the full price unlocked version if you get one. You can choose your own carrier without restrictions.

I got the Verizon prepaid version of the Moto E4. I was in a rush in December, needed to replace my old phone when a family member was hospitalized, and just grabbed whatever I saw on the shelf at Target. Good phone, good service with Verizon, but it's pretty much locked into Verizon's CDMA service. Even though the phone device itself technically can handle CDMA or GSM with a SIM card swap, in reality Verizon pretty much locks their versions into their network (or their authorized MVNO carriers). Verizon claims it can be fully unlocked with their authorized code and about half a dozen attempts to register with another network, but in reality it doesn't work. I had to buy another cheap ZTE Android phone to try with Simple Mobile's dirt cheap T-Mobile GSM data plan. Not very impressed with either the ZTE phone (sluggish) or Simple Mobile (throttled data plan, despite their claims of 4G LTE speed), so I'll go back to using the Moto E4 soon.