Does the A7 Pro's battery have overcharge / overcurrent protection? I don't see a logo on it for that? And if not, why not?

When I'm away hiking/camping I directly connect my phone & camera batteries to a DIY solar charger I've made and then swap them around. If the battery has no overcharge protection it will likely explode!

A7 Pro is equipped with a battery overcharge protection, but using DIY chargers is NOT RECOMMENDED AT ALL as it may damage your phone or your body.
Do it at your own risk. I will say it again: i don't reccoment to do that.

It's the battery I'm directly charging not the phone. Obviously I'll buy another one so I have a spare I can charge and swap them around. It's alright I've realised it cuts out at 4.35v so it wont go bang. Just that it's at a higher voltage than with my old phone's batteries and camera batteries.