Chosen Solution
Battery is dying - where can i get a replacement 15v 5.4w 1310/A
Try batterupgrade.com, send them an email. Good luck!
You can go to a battery shop such as Batteries Plus. They can change the battery for you or you can do it yourself. It requires care in disassembly and reassembly but when shavers cost $100.+ dollars, it’s worth it.
I had this same issue with mine (Phillips Norelco Multigroom, not a 3100 model but one with a turbo button on it) and when I took it apart (great tutorial on Ifixit.com) I discovered that it is just 2 AAA batteries soldered in. I just purchased a set of them at my local store and soldered them in. Works great again.
