ORIGINAL: fiery I use Eneloop packs. All good ...
Eneloop aregood for transmitters but use with caution as aircraft power packs, especially with high current draw servos/situations:
"Current related discussion
elsewhere regarding Eneloop cells.and benefit of battery voltage telemetry.
"Quote: Originally Posted by MikeMayberry - but take this situation for example: a guy was flying with a 5 cell 2000mah Eneloop RX pack that cycled easily to 2000 mah with a 1A load and worked fine in a sport application for over a year, but when that same pack was used in a larger application with multiple digital servos it fell flat on it's face and the low voltage warning would kick it under normal maneuvers.Of course if he had made a proper battery selection in the first place then everything else is moot.
The Eneloop cells are fine in transmitters and low load airborne use. But their high internal impedance makes them unsuitable for any kind of potentially high load use. Under load these cells have a large voltage depression due to the high internal impedance.
You do not need telemetry to tell you that - Silent-AV8R "
" Agreed that these batteries were the wrong tool for the job, but in this case the user was unaware that they were not suitable and luckily landed when the low battery warning went off, most likely saving the airplane. A loaded volt meter even at 2A (equivalent of one digital servo) would not have made a difference here as the load would not have been high enough to sag the voltage. Flight loads vary with the servos in use, but if you consider that a high power digital servo working hard can easily pull 2A each (or more) then the only accurate way to see how the battery handle the actual flight conditions is with telemetry.
Yes, most of you know what you're doing but so many R/Cers out there have no idea about how the flight loads can affect the battery voltage; this goes for BEC's used in Electronic Speed Controls which which with the higher voltage threshold of 2.4 is the culprit for so many brownout crashes. What percentage of pilots use a loaded volt meter every time they fly? Not many. How many with telemetry check their battery every time they fly? 100% <snip>". . Mike. "
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Regards
Alan T.