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Old 04-24-2013, 08:19 AM   #1 (permalink)
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Default TX Charging question

I have a Devo 7E and 8S. I use AA sized NiMh batteries in them. I had been taking out the batteries to charge in a separate charger, but found a transformer that I could plug into the back of the transmitter to charge the batteries.

The manual is a bit thin on charging the batteries, so I had a couple of questions.

1 - I have a 400 mA transformer and the TX states 200mA. I don't think that this is a problem, but wanted to double check.
2 - How do you know when the batteries are fully charged? Is it smart enough to shut off charging? Or do you just plug it in for an hour when things are low and then unplug it?
3 - For using a sim, can you just plug it in so you don't drain the batteries?

Thanks in advance.
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Old 05-06-2013, 07:08 AM   #2 (permalink)
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1. The current rating is a maximum and it doesn't matter if you draw less from the power supply. Note that if the supply is unregulated, the output voltage will be higher at lower currents.
2. I leave the charger plugged into my Devo 6 most of the time since the charge rate is low and NMH batteries can take a trickle charge indefinitely. I don't know what the charge rate is on your transmitters, though.
3. No problem keeping it plugged in during simming. With my 6 I don't find it necessary since I have the output power set very low for sim model. I'm not certain but many transmitters turn off RF when the trainer port is used anyway.
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Old 05-10-2013, 07:32 PM   #3 (permalink)
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When you are simming... or anytime something is plugged into the trainer jack, the Tx is not using the RF (radio frequency) transmitting circuit, and so the power usage is much lower than when you are flying for real, outside the sim. (as Jazzjohn said).

I've had several weeks, sometimes a month or more, in between charges when I'm just simming and not flying. Especially when using Eneloop batteries. ...and I sim almost every day.

The batts last a very long time when you are using the sim. I wouldn't bother charging while you sim.
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