If you're using your MFJ-259 for several hours per week, standard 2600
NiMH cells may be a good choice. If you use the analyzer only
occasionally, I think you'll be happier with either NiCd, or
low-self-discharge 2000/2100 NiMH.
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NiCad and NiMH batteries (usually having a capacity exceeding 400mAh)
which need to perform at all times I normally charge constantly with 10
mA when not in use. This trickle charge level keeps them in good condition.
I have a Wahl ISOTIP 2.4 V soldering iron which in this way is always
available. When in use I switch the charging current to 300 mA

Frank GM0CSZ / KN6WH