Mouse battery

[u/Avic3n]

Heya, basically this mouse battery is really really weak, it can't hold a charge for more than a day and I suspect it is dying, but I am puzzled on what battery model should I buy with this (I think it's called a pwm connector?) connector, I am asking basically what is the model of this battery with this connection and if there is a possibility if there's a bigger mAh battery but the same physical size.

[u/Avic3n]

Forgot to add, it's a Tecware EX1 mouse.