Craftsman Weedtrimmer 5 HP, 22-inch

I gave this to him some time ago. The batteries no longer can hold much of a charge so I am trying to replace them, since the spotlight is otherwise in good condition.

There are 6 AAA Ni-MH 1.2V cells, 700mAh. The outside cover read like this:

Ni-MH AAA 700mAh 7.2V
Do not dispose of in fire or
short circuit.
Lexel 0907.

I couldn't find a direct replacement by searching. 8/16/2016

There are four conductors attached to the six cells: Black, red, grey and white. I'm assuming there are two wire pairs, connected to each set of three batteries. When I receive replacement cells, I'll take apart the old battery pack and solder to the new cells. 8/16/2016.