Lots of great answers here.
Have 2 old diesel 4x4 mules here (had a gas gator before them). His and hers, a 1 row w/ dump bed and 2 row six seater. Run on ag diesel they will go up anything (have some steep slopes) no problem, have dragged some 1500lb rocks no problem. They are pretty much...
Lots of great answers,
1. not stated but I'm guessing you have Nicad batteries. They are notorious for not holding a charge and not having a long life (wife bought an expensive milwaukee set likely same age as yours and was disgusted because the batteries were always dead).
Lithium batteries...
Second that, I have 5 led flashlights and love them, makita (3), B&D and Ryobi. Standardized on Makita batteries and have adapters so the other two can run on the makita batteries. Also have an led headlamp thats usb powered (and makita usb adapter w beltclip).
Other tools I would...