Eneloop vs Eneloop XX batteries

[MattHarper]

I'm in need of a decent 4 cell RX pack for my newly restored Henseleit 3D-NT (thanks Buckers for an amazing paint job, photos to follow soon) and could do with some opinions on Eneloop and EneloopXX packs. Information on the performance of these packs under load seems to be non existent to say the least. The model uses four analogues servos plus a digital servo on the tail. On the bench, with an Eneloop four cell pack, the Voltspy volatge monitor dips considerably under load. Would an EneloopXX pack perform any better or is it par for the course for NiMh battery technology ?

Thanks

[Mark_T]

Personally I wouldn't use a 4xAA sized pack of any type of cell as an RX pack these days.

It is just too easy to dip low enough under load to cause problems, especially if you use Spektrum equipment.

[Steve]

Yes Mark, but he's talking about the 3DNT which has a specific slot to fit the battery into up near the back of the fuz (if I remember rightly?) which is only big enough for a 4 cell AA pack. It's a hangover from days of old pre LiPos etc.

My mate has a couple of 3DNTs and I remember one going 'in' a few years ago which he put down to a failed battery pack in the end. He then managed to re-arrange the layout to fit a much bigger Sub-C pack in I think (might be wrong here). He is an occasional user on this site.

PM nookybear and ask for a photo or something of how he got around it.

[cjcj1949]

You're probably fighting two problems. One is that your heli probably used NiCds and that servos used to take less current. It's not too difficult to work out how good cells are but the real problem is that they haven't been designed for our use. A lipo and a regulator would give the safest option or you could use a rx that allows you to have separate rx and servo supplies. Then the servo spikes won't reset the rx. NiMhs really are a waste of space.

[heliphil]

you really don't want to use AA size cells in a heli like that.....

[nookybear]

Hi
I got two of these and just put a 4 cell sub c pack under the receiver.
Its not whet they ask for but it worked for me ok and i didnt throw the balance out enough to make any difference.
I will be converting to lipo and regulator before its used again and will glue the regulator to the side frame.1320949126675.jpg

[MattHarper]

Thanks Guys for your replies. I had never even considered the brown out issues with Spektrum receivers which now makes me apprehensive about flying it in its current state. As others have mentioned, the model was designed around a 4.8V NiCad pack and space is very much at a premium due to belts and rotating pulleys. I think the way forward is to fit a small CC Voltage regulator.

Castle 10A BEC Switching Regulator CASTLEBEC

I can squirrel this somewhere under the receiver tray but the problem is where to install the battery. The battery area is 55mm wide, 20mm deep, with a maximum battery height of about 75mm so I'll need some square-ish shaped pack LiPo pack. Any ideas, may be a LiFe or A123 ..... ????