KWA SR7 Battery Question
Posted 07 June 2014 - 11:37 AM
LiPo Battery Charger-http://www.hobbyking...Warehouse_.html
Posted 07 June 2014 - 01:09 PM
Battery: 2.0mAh Out of stock i picked a few up for $20 shipped on ebay, around the same price as Hobby King. HK might have Lower mAh in stock.
The charger you posted is DC i don't think it has an adapter. There are better choices, i have a few different lipo chargers.
Mosfet: thats a burst it can be hardwired, that requires opening the gearbox, there is a DIY link in the forums for one with active breaking, It works!
Edited by tales, 07 June 2014 - 03:49 PM.
Posted 08 June 2014 - 02:54 PM
Edited by souljacker360, 08 June 2014 - 02:58 PM.
Posted 09 June 2014 - 02:21 AM
1. A 7.4v LiPO will give about the same performance as a 8.4v NIMH battery because the LiPO is capable of dumping current faster. For a performance increase -- trigger response and cyclic rate -- an 11.1v LiPO is what is used.
2. I doubt a $5 LiPO battery charger has a way to equalize the cells in the battery. There's a reason the preferred chargers are $50.
3. MOSFET is a metal–oxide–semiconductor field-effect transistor. As commonly used in airsoft triggers it's an electronic relay. The trigger contacts only handle a minute amount of current, just enough to trigger the relay which handles the heavy current. Since the relay is solid state there are no sparks or wear on the trigger contacts. To get the relay effect the device must be connected inside the gearbox, a pretty consequential task fraught with risks, lost parts, misassembly, etc.
The King Kong device Evike is selling can be wired into the gearbox as a MOSFET relay or just connected between the battery and gun. In this mode it's a burst controller and factory set to 3-round burst. I like the device when wired this way. But wired this way it does not protect the trigger contacts. KWA trigger contacts seen to need little or no protection from recent posts here.
1. Find an 11.1v LiPO that fits your gun and buy two (2).
2. Get a good charger that runs off 120v AC. Some use a wall wart and can often be connected to a car battery, others have the transformer internally. The "TB6AC" type chargers are close to universal and will charge LiPOs and your other batteries easily. The circuit boards and menus on these chargers are all very similar.
3. I like the King Kong burst device and you can just plug it in and shoot with it. If you get daring and your airsoft "armorer" skills eventually get good enough it can be wired into the gearbox to protect the trigger contacts and still retain the burst function. But note the post earlier this weekend of the installation problems of these devices. I readily admit I have not opened an AEG gearbox and currently have no intention to do so!
If you're buying batteries and chargers from the Orient it can take several weeks. The "US Warehouse" notation cuts the time to a week since the stuff is already in CONUS.
Edited by Chuck S, 09 June 2014 - 02:24 AM.
Posted 09 June 2014 - 06:02 AM
Posted 09 June 2014 - 06:18 AM
Posted 09 June 2014 - 12:30 PM
This battery will fit the SR7 Crane Stock. These are the same ones I use. Make sure to get these batteries specifically because the 1400 mAh and the 2000 mAh ones will not fit I believe. You can put two of the cells in one of the circular slots and the other cell in the other circular slot. As a word of advice, get two or three because these will not last very long, maybe 4 hours at most.
Posted 09 June 2014 - 12:50 PM
Edited by souljacker360, 09 June 2014 - 12:54 PM.
Posted 09 June 2014 - 01:55 PM
Posted 09 June 2014 - 02:02 PM
IMO, the 7.4 with a high RPM motor will give a ROF up there with a KWA stock motor and a 11.1V lipo.
Without sending another 3.7V through your gun, something to think about.
As for the charger, in airsoft there called smart chargers, RC there known as peak chargers, chargers aren't smart.
They detect when the battery back peaks in voltage and starts loosing voltage from over charging, and stops charging. The sooner it stops when over charging the better for the battery. Its a $10 airsoft battery not a $90 RC battery
I have chargers that top $100 and they shut off airsoft batteries as soon as the voltage starts to drop. Pack is room temperature not too warm
Airsoft chargers i noticed will continue to charge a battery after my LRP or Traxxas charger stopped charging them.
Leading to a warm - very warm battery, when over charged it lowers the voltage.
Im not saying buy $130 charger for a $10 airsoft lipo.
I think you will have to spent at least $20+ for a clone airsoft charger, JMO.
Edited by tales, 09 June 2014 - 02:45 PM.
Posted 09 June 2014 - 03:50 PM
Posted 09 June 2014 - 04:00 PM
2.0 lasts my son a whole weekend when he go to the Hamptons
That's where he uses 11.1s the most
Locally it's CQB and 7.4s
One cell in each compartment and one cell in the buffer tube
Still room for a small mosfet in the tube, if that's your goal
I can post a pic later if you like, there on the forums already
Edited by tales, 09 June 2014 - 04:01 PM.
Posted 09 June 2014 - 04:12 PM
Posted 09 June 2014 - 04:17 PM
Posted 09 June 2014 - 05:11 PM
The gun, i think it has that coiled wire in the buffer tube. Are you using the KK as a mosfet or burst?
I remove the fuse harness & pistol grip on KWAs when there new. I always forget to post that, sorry!
The gearbox wiring looks like this, three on the left go to the mosfet
Thats a GB for a different KWA, his 11.1 is in a K4 RIS with a ported piston Full metal rack, POM head and KWA M130 spring no Fet.
Using this motor he gets a high ROF
This is a fet left in one gun Pico AB fits in the tube with battery
Posted 09 June 2014 - 06:15 PM
@gcw360 Thanks man I will consider that since it is almost if not identical to the one by Tenergy and costs less as well.
Edited by souljacker360, 09 June 2014 - 06:15 PM.
Posted 09 June 2014 - 06:49 PM
That is a mosfet.
The mosfet you posted can work as a mosfet
Over riding the trigger contact & or a burst
What do you plan on using the mosfet for
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