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Old Jan 13, 2013, 05:50 AM
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United States, CA, Tehachapi
Joined Jan 2004
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The servos you have will not take a 2S LiPo. They are rated for 5 +/- 1, or 4 to 6V. A fresh 2S Lipo puts out over 8V and is rated at 7.4V. To use a LiPo RX battery, you need a ubec (micro Battery Eliminator Circuit). Just like whatís in most ESC's

Once upon a time, all Receiver packs were 4 or 5 NiCad or NiMH cells rated at 4.8V and 6V respectively (1.2V cells in series). Radios were designed to work on both, hence everything is rated 4.8 to 6V.

Modern Receivers tend to be more tolerant of higher voltages, because they use so little power internally (digitally) that their internal regulator can often manage much higher voltage. The receiver digital side often runs on 3.3V but only uses a couple mA, and it only sends digital signals to the servos. The power going to the servos is a straight line from the battery. You can see the traces if you look under the pins.

Servos on the other hand use lots of current to drive the motor, so dealing with a higher voltage means dealing with lots of power. You can get high voltage servos, but they are still specialty equipment prized for their high speed (and priced accordingly).

Iíd recommend any 500 to 1000 mAh 2S LiPo and a ubec (3-5 amp is fine). I ran all my ACE RC simple series planes with a standard 500mAh AA NiMH pack and managed 10 flights or more a session. Since you have the gear for electrics, thereís no point dealing with NiMH (even if your charger supports it).

Heads Up R/C has a couple ubecís at $8 - 10. Iíve used regular ESCís too by cutting the signal line on the receiver plug (so the ESC doesnít get a motor signal). Something to consider if you have an old ESC lying around.
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