Jump to content


KWA SR7 Battery Question


  • Please log in to reply
37 replies to this topic

#21 souljacker360

souljacker360

    Newbie

  • Members
  • Pip
  • 12 posts
  • Country:

Posted 09 June 2014 - 08:53 PM

@tales lol yea,I originally planned on using the MOSFET system as burst when I turn on full auto.

#22 tales

tales

    Specialist

  • Members
  • PipPipPip
  • 527 posts
  • Gender:Male
  • Location:Brooklyn NY
  • Interests:Fishing, RC cars, Building Motion Picture sets
  • Country:

Posted 10 June 2014 - 03:52 AM

Good, Then you won't have to open the gear box. Thats a much better choice for a charger, Decide on a battery that fits.
Maybe a lipo low voltage alarm, This will buzz when the batteries voltage starts to drop, giving you a warning to stop using it before the voltage gets too low.

#23 souljacker360

souljacker360

    Newbie

  • Members
  • Pip
  • 12 posts
  • Country:

Posted 10 June 2014 - 11:46 AM

@tales Yea I'm probably going to get the exact battery as you have just because of the mah.  Still deciding whether or not to pay money for the universal chargers some people have been mentioning in this post.

#24 tales

tales

    Specialist

  • Members
  • PipPipPip
  • 527 posts
  • Gender:Male
  • Location:Brooklyn NY
  • Interests:Fishing, RC cars, Building Motion Picture sets
  • Country:

Posted 10 June 2014 - 01:15 PM

Lipos can explode if not charged correctly. Thats what i was trying to get across when i said some chargers over charge, but it states that in the chargers specs. so its normal they over charge a little.

The $5.00? charger 1st charger you posted, is it worth the chance? jcw posted a good charger. And that man knows his sh*t
He walked me through EVERYTHING and gave me the confidence to work on these gearboxes.

I looked and all i see are clone chargers, they have displays and are AC/DC. Around $30
the one we use in the house. i keep it in viewing distance at all times.checking the battery a few times during charging.


Clone
http://www.ebay.com/...459839540&rt=nc


http://www.ebay.com/...sd=161132269652

If you use the 7.4V 2.0 first battery i posted i think that would be fine with a burst. If you hold the trigger it will go into full auto after .5 second? then you will notice a difference higher ROF using the 11.1V, the brick fits in the guns "Butt Plate" with the stock wiring. 2.0 nunchuck 3 cell i posted will require removing the coil wire from the buffer tube.

Edited by tales, 10 June 2014 - 01:16 PM.


#25 Chuck S

Chuck S

    Guru

  • Members
  • PipPipPipPip
  • 1,311 posts
  • Gender:Male
  • Location:Cleveland, Ohio
  • Country:

Posted 10 June 2014 - 05:41 PM

The "B6AC" charger linked above looks and functions just like my "TB6AC" (the T is for Tenergy (brand)).

Thirty bucks ain't a bad price and it's very versatile.

-- Chuck

#26 souljacker360

souljacker360

    Newbie

  • Members
  • Pip
  • 12 posts
  • Country:

Posted 10 June 2014 - 06:14 PM

@Chuck S I agree and I think you've sold me now hopefully nothing goes wrong in shipping and handling when I order.  I'm still having thoughts about whether or not that 11.1v battery @tales posted a picture of fits perfectly in my SR7. What I mean by that is I can just connect the plugs and put it inside the crane stock without any rewiring or any problems occuring.

#27 tales

tales

    Specialist

  • Members
  • PipPipPip
  • 527 posts
  • Gender:Male
  • Location:Brooklyn NY
  • Interests:Fishing, RC cars, Building Motion Picture sets
  • Country:

Posted 10 June 2014 - 09:10 PM

The battery link i left in the 2nd post will fit with no mods to the guns wires. (7.4V 2.0mAh nunchuck lipo)

To use the 11.1V 2.0mAh the 3 cell nunchuck lipo battery you might have to remove Parts: 519, 514, 515, 520 & 516 And replace them with straight wires, so one cell fits in the buffer tube part 509
http://www.kwausa.co...a05_km4_sr7.jpg


SR7 without the crane stock, Battery wires that exit the tube are straight, now there is room for a battery cell and the wires.
Posted Image

SR7 with the crane stock. 11.1V One cell top center, two cells lower left & right in the battery compartments.
For 7.4V just use the bottom two
Posted Image

A battery also fits in the butt plate, can be an 11.1 along with the 7.4V i posted no wire changes are needed

Internet pic
Posted Image

I never tried to fit a cell in the tube with the coiled wire part 519

Edited by tales, 10 June 2014 - 09:12 PM.


#28 Pyro_Buster

Pyro_Buster

    Enthusiast

  • Members
  • PipPip
  • 125 posts
  • Gender:Male
  • Location:California
  • Country:

Posted 10 June 2014 - 11:53 PM

When you take the gearbox out to rewire it, there's two places the wires disconnect, right? Do I have to keep those pieces? Or can I take them out?

Attached File  image.jpg   41.73K   4 downloads

Edited by Pyro_Buster, 10 June 2014 - 11:54 PM.


#29 Chuck S

Chuck S

    Guru

  • Members
  • PipPipPipPip
  • 1,311 posts
  • Gender:Male
  • Location:Cleveland, Ohio
  • Country:

Posted 11 June 2014 - 02:47 AM

I have King Kong devices for BURST (rather than AUTO) in my KM4 and RM4.  I used the word "devices" because, while they have a MOSFET chip in them the airsoft world uses the "MOSFET" when they really mean "electronic trigger relay."  ;)  The King Kongs can be set to AUTO and back to BURST very easily.  They take up little room in the gun, but it's tight with some batteries.

The King Kong has a low voltage alert and cutoff that will protect the LiPO battery.  Beeps when near low limit; cuts the current when that limit is reached.  Good practice is to remove the battery between uses but no one does.  Charge periodically.  My charger (and LiPO fire bag) sit next to my desk where I can monitor the charge process.

The reasons for a "smart" charger are many.  LiPO cell voltage should not be allowed to go below 3.2v or damage can result; charging to too high a voltage can damage them also.  Maximum cell voltage fully charged is 4.2v so an "11.1v" LiPO is really 12.6v.  The multiple (2 or 3) cells should have their voltages equalized or the weaker cells will constantly siphon current from the stronger cells and eventually deplete all the cells. One of the "AC6" chargers will maintain batteries better.

Find a battery that gives the performance you want and get two (2).  One will eventually fail or be depleted and a spare in your kit will put the gun back in the fight quickly.

-- Chuck

#30 tales

tales

    Specialist

  • Members
  • PipPipPip
  • 527 posts
  • Gender:Male
  • Location:Brooklyn NY
  • Interests:Fishing, RC cars, Building Motion Picture sets
  • Country:

Posted 11 June 2014 - 05:32 AM

View PostPyro_Buster, on 10 June 2014 - 11:53 PM, said:

When you take the gearbox out to rewire it, there's two places the wires disconnect, right? Do I have to keep those pieces? Or can I take them out?

Attachment image.jpg

You can remove them. Hard wire (solder) your battery lead & connector to them.
In reality that's re-wiring the fuse harness
If you're installing a mosfet you have to re-wire the gear box
So three wires exit the gb towards the battery not two like in your pic

#31 souljacker360

souljacker360

    Newbie

  • Members
  • Pip
  • 12 posts
  • Country:

Posted 11 June 2014 - 09:14 AM

@talesThank you for clarifyingthat's what I initially had in mind, just take each cell and put them in the holes just as you said for an 11.1v sorry if I had made do more work. As for the MOSFET I only planned to use it as burst so the gearbox has less stress when I use full auto. Would it be safe just to run without a lipo battery warning? I could just change the battery as soon my gun starts to lose performance.

#32 Pyro_Buster

Pyro_Buster

    Enthusiast

  • Members
  • PipPip
  • 125 posts
  • Gender:Male
  • Location:California
  • Country:

Posted 11 June 2014 - 11:33 AM

View Posttales, on 11 June 2014 - 05:32 AM, said:



You can remove them. Hard wire (solder) your battery lead & connector to them.
In reality that's re-wiring the fuse harness
If you're installing a mosfet you have to re-wire the gear box
So three wires exit the gb towards the battery not two like in your pic

I'm not planning on using a MOSFET, so in reality I don't even have to take those off? I can just solder my wires to the inside of the socket?

#33 tales

tales

    Specialist

  • Members
  • PipPipPip
  • 527 posts
  • Gender:Male
  • Location:Brooklyn NY
  • Interests:Fishing, RC cars, Building Motion Picture sets
  • Country:

Posted 11 June 2014 - 12:11 PM

View PostPyro_Buster, on 11 June 2014 - 11:33 AM, said:

I'm not planning on using a MOSFET, so in reality I don't even have to take those off? I can just solder my wires to the inside of the socket?

No you don't have to take them off.  Im not sure if one of the three battery sticks will fit in the buffer tube along with the coiled wire.

What socket? If you're talking about the connector, i suggest removing the "socket" and solder wire to wire.

#34 Pyro_Buster

Pyro_Buster

    Enthusiast

  • Members
  • PipPip
  • 125 posts
  • Gender:Male
  • Location:California
  • Country:

Posted 11 June 2014 - 12:55 PM

View Posttales, on 11 June 2014 - 12:11 PM, said:



No you don't have to take them off.  Im not sure if one of the three battery sticks will fit in the buffer tube along with the coiled wire.

What socket? If you're talking about the connector, i suggest removing the "socket" and solder wire to wire.

I'm planning on rewiring the coil of my SR7 so I can put my Magpul STR stock on, and place a 7.4 lipo in the buffer tube. The socket I was referring to was indeed the socket of the connector. Thanks for the clarification.

#35 JesseHammil

JesseHammil

    Enthusiast

  • Members
  • PipPip
  • 56 posts
  • Country:

Posted 29 June 2014 - 06:53 AM

Haha I know I had trouble with installing my MOSFET, but its in and working like a champ now ;)

#36 gcw360

gcw360

    Supreme Guru

  • Super Moderator
  • PipPipPipPip
  • 11,606 posts
  • Gender:Male
  • Location:New Jersey
  • Interests:Airsoft (Especially repair and customizing), Fly Fishing, Fossils (Especially Dino), Snakes, Photography
  • Country:

Posted 29 June 2014 - 06:11 PM

View PostJesseHammil, on 29 June 2014 - 06:53 AM, said:

Haha I know I had trouble with installing my MOSFET, but its in and working like a champ now ;)
They are a lot of fun when they work.  I love mine!

#37 JesseHammil

JesseHammil

    Enthusiast

  • Members
  • PipPip
  • 56 posts
  • Country:

Posted 30 June 2014 - 08:32 PM

View Postgcw360, on 29 June 2014 - 06:11 PM, said:

They are a lot of fun when they work.  I love mine!

Yeah, pretty neat!

#38 souljacker360

souljacker360

    Newbie

  • Members
  • Pip
  • 12 posts
  • Country:

Posted 27 July 2014 - 12:06 PM

@tales Sorry to be bring up this topic again but I just need re-clarification, so in order for me to use the battery in the link below I would need to remove the parts you mentioned in your earlier post? (I'm not using MOSFET anymore)

http://www.hobbyking...idproduct=24207

Edited by souljacker360, 27 July 2014 - 12:07 PM.





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users