Fwiw about a year ago I got the Peanut, a professional plug-in trimmer that costs $45. It works way better than any battery-powered trimmer I've tried.
Only drawback is that you change the length by replacing the guard instead of just sliding it to a different position; one day I didn't notice the guard was off and with one swipe it was too late to salvage my beard. I removed the rest and started over; luckily I keep it short anyway.
Corded products are underrated. It's a hassle to deal with the cord, but it's worth it when not needing to worry about if the battery is charged when you start, the battery running out mid-task, or plugging in the battery to charge after and remembering to unplug it later.
The issue with the cord can be greatly improved by having a nice retractible extension cord. Easy to take out, easy to put back, easy to move, easy to store.
I did the same thing maybe 7 years ago and the peanut still just works. I got tired of needing to buy replaceable blades or forgetting to charge it or the unreplaceable batteries just crapping out. I don't even keep a beard. I just use the peanut without a blade guard and it cuts close enough for me. No razor burn or pulled hairs ever.
Only drawback is that you change the length by replacing the guard instead of just sliding it to a different position; one day I didn't notice the guard was off and with one swipe it was too late to salvage my beard. I removed the rest and started over; luckily I keep it short anyway.