Sunwayman T45C + other 2 battery torches

Does anyone know if it’s possible to get a replacement T45C switch/board/emitter assembly? I’ve had it for years, love it, took it apart and now it won’t work. The problem was probably because the batteries were degrading over time.

I now also have a Fenix TK35UE v2 which is great, although I found I have to have hi drain batteries which the Sunwayman didn’t need.

What are your suggestions for a good 2 battery torch?

thanks
Nick (the Gooner)