Thinking about making a smaller e-mag battery?

[sniper1rfa]

from what i heard, lithium polymer would work fine. Expensive though (i admit that i dont know a lot abou them).

out of curiosity, do the lit-pol cells have the same cathode degredation problem as lithium-ion?


lithium ion wouldnt work. Cant sink the current, and they dont like working in packs.


The 650 mAh cells in the normal emag pack are about as small as you can get. Datapimp and i did some work with them, and the 2/3AAA 320 mAh cells work great for about 3000 shots, then they start skipping. That is essentially one size smaller than the normal emag packs.

feel free to email me with questions about any pack building. i think between me and barrytolar, we can answer anything abut any chemistry. :-)

[BarryTolar]

I've not noticed problems with the Lit Polys except when I do things to them your not supposed to

Of course if you treat Lit Ion's it's not a significant problem of course this is just in my expercience I know it's supposed to be a problem just saying I haven't noticed it with either chemistry

The main thing to worry about packing up lit ion is keeping them matched and then charged properly but 3amp is pushing most of the lit ions pretty hard so Poly is just the only way to go

one thing to note I'm kinda surprised 2/3 AAA nimh could handle 3amp for an extended time period although the nicads could but I'm just guessing that the weight wasn't a LOT less than the stock pack - I dunno know though

Ahhh I miss my brushless airplanes - currently doing ultralight indoor and parkflyers so as to relax my nerves9(that was my excuse for getting into Efly in the first place and well a 50mph place ain't relaxing)

Now if I could just learn to spell

Barry

[Hexis]

I'm super interested in this. A couple questions.

From the looks of it, I would need 4 packs, either the 700s or the 1200s, wire them in series, and connect to the emag.

What kind of charger would be needed? Got some links to appropiate choices?

[BTAutoMag]

if you do make this, keep the battery pack where it is... i think it looks great, dont change the placement

[sniper1rfa]

its only 20 ms at a shot, so many cells could do it. It wouldnt surprise me if a 1/3AAA pack could do it for a couple shots.

The GP cells i use have similar or lower internal resistance than NiCad cells. They can handle anything nicad can.

[FragTek]

I hope someone turns this project into a reality

I would love to have a battery thats at least 1/2 the size of the one currently on the mags, while retaining the style of the CnC housing... The best of both worlds would be awesome!

Good luck to you Hostage!