Most repairable razor/trimmer brands?

I want to replace my ~15 year old Braun trimmer after the batteries died for the third time. I had to replace the batteries twice by soldering, which is a PITA, so now I am looking for a model with more accessible batteries. AFAIK no brand makes trimmers with user-replaceable batteries, so at least they shouldn't be soldered, like the one in this video. I could not find any disassembly instructions for the latest generation models, so I would appreciate any other suggestions.