Tektronix THS720AJun. 2020
Unfortuneately, I received my Tektronix THS720A only with a dead proprietary NiMH battery pack. However, regular NiMH C-cells do fit into the battery compartment. I soldered a wire to the plus wire coming from the ring contact and extended it up to the battery compartment cover.
The scope works perfectly with cheap commercial low self-discharge NiMH cells.