Good Sunday Morning, All!

A buddy of mine plans on ordering a TREX 600 on Monday. Obviously I'm quite pumped to see it in action, but we're stuck on batteries. As I understand it, he could buy 3 Thunder Power 11.1v 2100mah batteries and wire parallel/series to come out at 22.2v 4200mah - or something of that nature. I know I've read about this somewhere (and with a vague understanding of electronics, it sounds believable), but I cannot find the exact instructions for doing it.

Also, is there a way to wire them with Deans connectors so you can pull the three batteries apart and use them in a TREX 450?

Thanks, guys!
- Chaz

How did you come up with 3 cells? You need 4 11.1V batteries to make it works. Two of the batteries are in series so give you 22.2V 2100mAh, and repeat the same thing for the rest of the 2 cells, parallel them together to give you 22.2V 4200mAh. You can kind of see the wiring diagram from the following thread.

http://helifreak.com/viewtopic.php?t...alell+parallel

Yup, 4 makes a lot more sense, thanks!

I was kinda doing the math while I typed that and realized it seemed wrong.

That answers my question. Anyone have any experience/opinions on doing this? He's already got a 450SA, so we figured it'd be nice to have the smaller batteries that he could use with that if he felt like it.

Thanks!
- Chaz

I fly my bigger choppers with two packs instead of one. (2x 4400 mAh 3S1P).

The only real drawback is that you need to charge twice as many batteries for a single flight. I've got 2 (er, actually, 3 now ) chargers, so it's not a big deal for me, but not everyone has multiple chargers.

You also get a nice mess of wires on your bird.
But it's nice to be able to use the same batteries on smaller models, so it's a good route to go if you want to save money.

Here's what the wiring connectors look like:

Parallel
http://www.truenorthernhobbies.com/p...roducts_id=116

Series
http://www.truenorthernhobbies.com/p...roducts_id=115

You would use two parallel harness' to connect the two sets of batteries to make them 4400 mAh, then use one series connector to connect the two parallel leads to increase their voltage.


EDIT: I forgot to mention that if you go the multi-pack route, it's important you have a balance charger on hand, since running different packs of different age will inevitably cause some difference in how one discharges compared to the other. It's a good rule to not cut it too close in terms of flight time or you risk draining one of your packs to low.

I see! Thanks for the advice, I'll be sure to mention the balancer as I know he doesn't have one. Are there any batteries that are better for this than others? We were looking at Thunder Power 2100's.

Thanks, guys!
- Chaz

I am biased but... nothing delivers the power to my 600 like Flightpowers new 25C 6S 5000 packs.