You might want to consider the following charger. You will need a 12v convertor for home and use your car battery at the field.
There is no programming required. No off/on switch. Just plug and play.
This is just food for thought.

Sirius Charge Pro Series (Plus)

Designed Specifically for Radio Control Batteries

Rejuvenate batteries while fast charging
Fast charges TX and RX at the same time
1000 mA charge rate
Eliminates cycling & overnight charging
Operates from 12 volts DC
Includes connectors
Rugged cast aluminum case
Transmitter channel charges 4 to 8 cells,
250 to 4000 mAh NiCd and 500 to 3000 mAh NiMH cells
Receiver channel charges 4 to 6 cells,
250 to 4000 mAh NiCd and 500 to 3000 mAh NiMH