Review (5/5): Are you MAN enough to operate a solder iron?
I have had the T770 for a LONG time (well over 10 years). Mine is the original all black one - it has no gray accents. The batteries - like any device - go bad after a few years. I am on my fourth set of them. However my cutter is still the original. I believe it is self sharpening as it cuts just like the day I bought it. You can really research and get some great replacement batteries with high mah (capacity). I usually get 2400mah replacements (combined) and the clipper needs charged like once a week. I will say there is slight soldering involved in battery replacement but there are guides and videos out there. However, if you’re man enough to have a beard, hopefully you’re man enough to solder some new batteries in.