In my circuit, I used a simple charger circuit that works fine with standard battery packs that come with an overcharge/discharge protection circuit like this (green PCB inside.)
But I have some restrictions in my case and needed to use shaped batteries and found cell phone batteries like this
Currently, there are many batteries from different companies which I can find many good shapes and capacities. I have two questions in general:
Are they as good as these standard batteries, I mean in life quality and capacity?
Do these batteries come with charge/discharge protection circuits? If it varies how can I check them because most of them cannot be opened easily.