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Highfields Amateur Radio Club
Glossary Appendix.

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Battery Details.

In reality this, quite expensive, battery is just 2 × AA batteries back to back with a plastic cage to hold them together. See below for how to "roll your own".


2 × "AA" batteries, CNB-401, FNB-59, FNB-79, MHFNB59, MH-FNB-59,

not to scale.
Height × Width × Length.
Chemical Composition. Nominal Voltage.
battery FNB-59. 50.5 mm × 14.5 mm × 30 mm (approx).

Designed to only fit one way.



2.4 volts.

This is so simple as to be unreal! Works on the Yaesu VR-500 and should work with all other models that take the same battery.

  1. Get 2 of your chosen rechargeable AA size batteries.
  2. Look into the battery compartment, there is a side contact near one of the Negative terminals. Place one of your batteries into the other battery slot.
  3. Remove about 1 cm of the plastic jacket from the Negative end of the other rechargeable battery. As long as the case and base are 1 piece (usually the way, you can check with a meter that the case is Negative) just slot this battery into the slot with the side contact. Replace battery cover. Job done!

In the unlikely event that your rechargeable is of a different construction and the case is Positive (some are!), wrap a couple of turns of electricians tape around where you took the casing off to re-insulate it (check that the edge is covered too, if needs be) and, with a small piece of tin foil, wrap the base and (now insulated) case so that the foil will make contact with the Negative pole of the battery and the side contact. Then carefully fit this battery into the slot and replace the cover.

Switch on to check it is working. Then, if all is well, plug in the power lead and it will charge.

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