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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › 9chps charging question
03-29-2005 08:03 AM  13 years agoPost 1
windmeup

rrNovice

Westminster Ca.

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just bought a 9c, how does the 110 ma tx charger keep from overcharging the 700 ma battery ? and also what is a poli-switch

thanx in advance

Just don't windmedown, I do not have a reset button

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03-29-2005 05:35 PM  13 years agoPost 2
fritzthecat

rrKey Veteran

Virginia Beach, VA

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The charger uses the radio owner to unplug it after the battery is fully charged - about 10 hours if totally empty.

A Polyswitch is a form of Positive temperature coefficient resistor which acts as a self repairing fuse.
A polyswitch has a current rating. When the current flowing through the polyswitch, (which acts as a resistor) exceeds the current limit of, (for example) 1000mA, the polyswitch warms up above a threshold temperature and the resistance of the polyswitch suddenly increases from a few ohms to a few kilo ohms.
When the polyswitch cools down again the resistance drops to its former level.

Fritz


'Send Money, Women and Guns!'

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03-29-2005 05:39 PM  13 years agoPost 3
z11355

rrMaster

New England

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The charger uses the radio owner to unplug it after the battery is fully charged - about 10 hours if totally empty.
That's some pretty seriously advanced technology

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03-29-2005 06:43 PM  13 years agoPost 4
windmeup

rrNovice

Westminster Ca.

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I guess i deserve that!

thanks for the info on the poli-switch


But I still do not understand why futaba would sell a miss matched charger and battery? why not just put a 1100 ma battery in the tx
or make the charger 70 ma output for the 700 ma battery that came with the radio! The rx match's 1500 ma battery , 150 ma output on the rx side of the charger.

Just don't windmedown, I do not have a reset button

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