Phone is unresponsive

[albafrati]

If you already followed fxc hint without success you cold try to charge battery with external charger. I could manage to charge many batteries using a voltage and current controlled power supply. If you choose 4.1V and 300-500mA values you should succeed in charging. If the phone won't start with battery charged there must be something broken on the phone.

Thanks for the suggestion. Is there a charger you can recommend? Cheaper the better. I'm working on a budget. ?

AFAIK there's not a specific charger that can host that battery. As I wrote you can try with a desk power supply, there are many on any market starting fron about 50€. Anyway you have to build something to connect to the battery contacts.
this is an example:
https://www.amazon.com/dp/B071RNT1CD/ref...k_detail_3?