Lithium Ion battery for the E/X-Mag?

[JimBobFett]

My suggestion would be for someone to hook up a variable power supply with a scope to see what the minimum voltage and actual current spike is when hooking up an E/X-mag directly to a power supply. Then, if you can play with the maximum current output and see what the minimum needed to fire the solenoid actually is, we can go from there to get the right battery pack.

[Justus]

I'm just happy that this thread didn't completely die. ANYTHING to help shave some ounces off the weight of an Emag, coupled with perhaps better battery life, will help.

[2xFast]

Far from it.

If anyone wants to try the 4S before me here's what I'll probably pickup in the near future:

http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=20418

It should fit in the existing housing and have plenty of available amps...just a question of voltage. Also for some reason its actually slightly heavier than my proposed 5S option. I'll let folks know once i have it in hand...still won't be testing until I get the new board.

[athomas]

That hobbyking pack is 30mm thick. The standard emag battery housing only holds a 20mm thick pack. If you split the pack into two sections, it still doesn't fit due to the length.

This one will work for you and will drop into the existing housing. It is only 450mAh, but that's still more than 6 cases of paint before it needs a recharge. If you need more capacity, get two and keep one in reserve in case you need it. http://www.cheapbatterypacks.com/pro...V-4S-pack.aspx

[GoatBoy]

I'm just happy that this thread didn't completely die. ANYTHING to help shave some ounces off the weight of an Emag, coupled with perhaps better battery life, will help.

Don't you run with a warp+rotor as well?

In your case... wonder if you could consolidate all the batteries.



Also, forgot to mention -- do the E-mag electronics have any sort of low voltage cutoff? What is it, and can it be overridden?

[Justus]

Don't you run with a warp+rotor as well?

Normally, yes. But I sold the Rotor and will be ditching the warpfeed as I go with a Halo warpless. Just need to finish cutting a custom bracket.

Also, I picked up a Qloader from Freedy, so when I can get a CMS again, I'll have that option for smaller games where I won't need more than 300 rounds at a time.

Both of those feed systems save a lot of weight. And ditching the warpfeed should allow me to set my gun down without it being all lopsided.

[Justus]

That hobbyking pack is 30mm thick. The standard emag battery housing only holds a 20mm thick pack.

I've checked this thread, but didn't see that anyone has posted the dimensions of the standard Emag battery pack. Anyone? I can grab my calipers and post the dimensions tonight if nobody posts this morning or afternoon. Just need to make sure that a new Lipo pack will drop into an existing Emag battery pack housing.

[GoatBoy]

Wait, was that was those Q-loader elbows were for?

I haven't seen any specs posted so far. Data, guys. Data, data, data.

[Justus]

Wait, was that was those Q-loader elbows were for?

Yeah, trying to see if I can get the ball stack coming out of a Halo Too to turn upward and into my warp breech without modding the hopper at all, making it completely reversible yet still extremely low-profile. I'm pretty sure it will work just fine - I just need to bracket it and connect everything.

[2xFast]

I haven't seen any specs posted so far. Data, guys. Data, data, data.

The data's around if you look for yourself but here it is all in one place....such as it is. This isn't rocket science, just a packaging issue. Possibly a fire hazard

In the end I'll probably make myself a new battery housing for the LiPo pack, seems like there are too many trade-offs trying to get something that matches the stock housing.

[2xFast]

I got the packs in today. Again this is where it stalls for me until I get my new circuit board. That said here's option one for me.









I'll eventually charge these and do a few test cycles...check that they can handle high rof without catching fire...if we're good I'll try to source individual cells for a single pack. If that falls through I may look at buying more of these and dissecting until I can scavenge enough cells for a proper balanced pack.

[GoatBoy]

The data's around if you look for yourself but here it is all in one place....such as it is. This isn't rocket science, just a packaging issue. Possibly a fire hazard

In the end I'll probably make myself a new battery housing for the LiPo pack, seems like there are too many trade-offs trying to get something that matches the stock housing.

Good deal. Yes, it is convenient to have it all in one place. And if we're talking about it here, then this is that one place

It looks like you can fit a single 500 in there if I'm seeing that correctly. I would make like an e-mag adapter, which would be spring connectors on one side adapted to JST or whatever on the other. It looks like you'll have enough space to do so, if there's not too much excess wire. Dunno if those spring clips are readily available elsewhere or there's some other way to source them. Given the extra space you could get ... somewhat creative. Like mounting the spring clips and JST adapter onto a small PCB, and adding a few other goodies, like a low voltage/cell health alarm.

I wouldn't worry so much about pack semantics like balancing or whatever. Get into that later.


Last thing is to simply test if the voltage really is good enough. Make sure to have your Level 10 tuned...

[athomas]

I got the packs in today. Again this is where it stalls for me until I get my new circuit board. ...

...I'll eventually charge these and do a few test cycles...check that they can handle high rof without catching fire...if we're good I'll try to source individual cells for a single pack. If that falls through I may look at buying more of these and dissecting until I can scavenge enough cells for a proper balanced pack.

These will handle the load quite well. Their specs indicate that they can handle 17.5A which is much more than the required 6A. The voltage for a 5S pack (3S + 2S) is more than adequate and will produce the required 6A.

To run them just connect in series. For charging, you'll have to connect each pack to a charger independently for proper balance charging, or make an adapter to convert both plugs to interface a single plug so that both packs can be balance charged together.

The packs are too long for the emag case. Make a piece that bolts onto the bottom of the emag pack to extend its length, and you can still use it.

[Xmagterror]

I am playing around with this light battery idea too. I will leave the battery packs to someone else with the know how but i was thinking about 5 axis machining a new battery housing for the new pack.....make it look cool.
If done right it could give the gun a new look.

[GoatBoy]

Oops didn't notice you were shooting for 5s. Voltage should be plenty. Good luck with that.