I have noted some warnings on SARFLY about the use of NimH receiver packs. As I have been using a 650 mAh NimH receiver battery pack in my 40 size Acrow Wot without any problems for the past 2 years, the following comments may be helpful:
Be aware of the fact that NimH batteries have a higher self-discharge rate than Nicads. Recharge your NimH batteries on the day that you intend to fly - my GP 3300 cells normally take another 400-500 mAh charge, even if I charged them the previous day. My el cheapo (Uniross) 650mAh NimH receiver pack normally takes another 100 -200 mAh to full recharge after standing for a few days. NiCads have a lower self discharge rate, and thus stay fully charged for longer.
Note that the voltage drop under load on NimH batteries are higher than Nicads - which may slow down your servo response under heavy loads. My suggestion would be to use a 5 cell battery pack if using "El Cheapos.
The discharge curve on NimH batteries is steeper than Nicads - gradual loss of power vs sudden drop with Nicads. May be a good thing though - if your plane becomes sluggish, consider landing. If you were using Nicads, you are in trouble as you should have been on the ground already!
Regards,
Andre
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