BatteriesAmerica.com are great people.
I am still using 2700mAH NiMH AA cells in the FBA-25 shell, and charging with a now-discontinued MAHA charger that charges up to eight individual cells.
2700mAH ... turned down to 2W TX power ... us Ng an earpiece - that combo lasts a LONG time between charges!
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Clint Bradford K6LCS
http//www.work-sat.com
Clint Bradford