These are mods i have previously done but wanted to make a thread for as i may be doing more at some point in the future.
Xtar MC1 Plus with a voltage indicator and current selector switch. I changed the sliding internal current switch to an external clicky so i can control whether it does the 500mA or 1A charge rate.
Normally this charger only charges cells longer than 53mm with the higher current setting.
I find this useful if i want to charge a 16340 or 18350 IMR cell a bit quicker.
Klarus CH1 with voltage indicator, battery retention bar and built in charging lead.
DQG Brass 10180 & 10250 Charger
Charger Board Mods