General Section  8 
Battery Charging  
Transmitter/Receiver 
 
Note: It is imperative that you fully charge both the 
transmitter and the receiver battery packs prior to 
each trip to the field. To do so, leave the charger 
and batteries hooked up overnight (16 hours). The 
first charge should be approximately 20–24 hours 
in order to fully charge both battery packs to peak 
capacity. 
The charger supplied with this system is designed to 
recharge your batteries at a rate of 65mAh for the 
transmitter and 150mAh for the receiver battery pack. 
Transmitter Only 
The center pin on all JR® Remote Control Systems is 
negative. Therefore, the center pin on all JR chargers is 
negative, not positive. This is different from many other 
manufacturers’ chargers and radio systems. Beware of 
improper connections based on “color-coded” wire 
leads, as they do not apply in this instance. You must 
make sure that the center pin of your JR transmitter is 
always connected to the negative voltage for correct 
polarity hookup. 
Important: Please note that the charging polarity of 
the transmitter and receiver are different. 
Charger 
The pilot lamps should always be on during the 
charging operation. If not, check to make sure that both 
the transmitter and receiver are switched off. 
Do not use the charger for equipment other than JR. 
The charging plug polarity may not be the same. 
Equipment damage can result. 
Do not use other manufacturers’ after-market 
accessories that plug into the transmitter’s charging 
jack if you are unsure of compatibility issues with your 
radio. Seek expert advice to avoid possible damage. 
During the charging operation, the charger’s 
temperature is slightly elevated. This is normal.