GPX Superlight 1 battery mod question

Does anyone know which JST size it uses? I tried searching, some shows 1mm, some shows 1.25mm. I want to grab a bunch of batteries from Aliexpress and I just want to make sure.
Also, is 130mah worth it? I know its a gram lighter than the usual 150mah and hold less power. I'll be mainly using 2000hz, max firmware on ATK mouses and 1000hz on other mouse.