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My upgraded SR5 needs a new battery


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#1 josesoto14

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Posted 31 August 2014 - 03:16 PM

Hi, i recently upgraded my sr5 with:

Full metal piston
Madbull 363mm TBB
Prommy m135 spring
lonex 70 degrees bucking

Previosly I was using a 9.6v nimh 1600mah, but now I need more power to pull the spring since my current battery cant do. I dont wanna go lipo. Will a 10.8v Nimh do the job, or has anyone tried a 9.9v/13.3v Lifepo4?

Another question is...what´s the relation between mah and the "discharge rate" in terms of energy able to pull a m135, I mean, are both needed or can a 7.4v lipo 15c have the power to do the job? Get what i mean?

#2 StealthTaskForce

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Posted 31 August 2014 - 04:13 PM

Have you done anything with the motor? You shouldn't have to upgrade the battery just to pull a higher spring. If you're still on stock KWA motor, it's only supposed to pull up to an M130


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#3 Larry

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Posted 31 August 2014 - 06:31 PM

I have to agree with StealthTask Force, a high torque motor like ZCI 30$, JBU 40$ or a Lonex A2 50$ is where you want start.  A 2200mah 7.4 would match up well with any of those motors also Josesoto14.

#4 josesoto14

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Posted 31 August 2014 - 06:52 PM

thanks for your quick responses...I read somewhere in this forum that a kwa can pull up to a m150...I also tested my current setup with a 11.1v lipo and it was doing the job just fine...

#5 StealthTaskForce

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Posted 31 August 2014 - 08:16 PM

View Postjosesoto14, on 31 August 2014 - 06:52 PM, said:

thanks for your quick responses...I read somewhere in this forum that a kwa can pull up to a m150...I also tested my current setup with a 11.1v lipo and it was doing the job just fine...

Okay yeah I found my post from earlier that said it could go up to an M150. What gcw said after that, was that anything past M135 i think, needed to be reshimmed. Maybe the Lipo can pull it, but perhaps if you reshimmed your gearbox, the 9.6 NiMh could do it as well. Cuz you did say you didn't want to go lipo, so you could either try a stronger battery, or the motor, but either way I think you should reshim your gearbox.

#6 gcw360

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Posted 01 September 2014 - 04:40 AM

Jose - Why don't you want to go LiPo?

#7 josesoto14

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Posted 01 September 2014 - 09:53 AM

You know...that old myth that lipo strip gears, damage trigger contacts, can cause fire, etc...

Also my gun is way too hot now, 520fps with .20. All i wanted in first place was to achieve like 450 to settle in the 400 ish with 0.25..


#8 StealthTaskForce

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Posted 01 September 2014 - 04:22 PM

They don't cause fires if you do whats directed. Never over charge, never completely discharge, lipo safe bag, that sorta thing. Follow all the warning labels, and it won't be anymore dangerous than a NiMh or NiCad. And I've also seen KWA trigger contacts run on lipos with thousands of rounds through them and they still look brand new. Gears as well. So at least in a KWA gun, you should be alright to go lipo.

#9 BLATEY

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Posted 01 September 2014 - 04:49 PM

I second a lipo, also they do take some care but very manageable.
You can also put the lipo in sand instead of buying a lipo sack if you choose to take this route.

#10 gcw360

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Posted 02 September 2014 - 04:00 PM

Here is some additional information that might be useful.

My son and I only use Lipos.  The key is to get one that isn't too big with too high of a discharge rate (1200 mAh 15C) unless you add a MOSFET with active breaking.  Make sure you get a good charger too.  The investment is well worth the 50 bucks.  Here are places to look:

Batteries - Hobby King (warehouses in US and overseas...order from the appropriate warehouse based on your location - http://www.hobbyking..._Batteries.html

A decent battery will set you back about 10 bucks

Charger - Thunder AC6 - http://www.hobbypart...CFSMV7AodbQoARA

Lastly, I recommend a low voltage alarm: http://www.airsoftat...ter-p/00565.htm

Note:  You can find them for closer to 5 bucks with a little searching.

Hope this helps!

#11 tales

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Posted 03 September 2014 - 06:29 PM

View Postjosesoto14, on 31 August 2014 - 03:16 PM, said:

Hi, i recently upgraded my sr5 with:

Full metal piston
Madbull 363mm TBB
Prommy m135 spring
lonex 70 degrees bucking

Previosly I was using a 9.6v nimh 1600mah, but now I need more power to pull the spring since my current battery cant do. I dont wanna go lipo. Will a 10.8v Nimh do the job, or has anyone tried a 9.9v/13.3v Lifepo4?

Another question is...what´s the relation between mah and the "discharge rate" in terms of energy able to pull a m135, I mean, are both needed or can a 7.4v lipo 15c have the power to do the job? Get what i mean?

the only Lifepo4 batteries i seen are for receivers or transmitters in RC, not wired for motors. even though they have a high current "C" rating there not wired for motors. higher C ratings will only damage a AEG if something jams and you continue to sent current (pull trigger)  I've seen nicads cause massive motor damage.  
Do you have a link to the batteries?

#12 gcw360

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Posted 04 September 2014 - 10:31 AM

See here. http://www.airsoftgi...roducts_id=5806

It never seemed to catch on and I think I have only seen one in use ever.

#13 tales

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Posted 04 September 2014 - 01:42 PM

View Postgcw360, on 04 September 2014 - 10:31 AM, said:

See here. http://www.airsoftgi...roducts_id=5806

It never seemed to catch on and I think I have only seen one in use ever.

Thats 9.6V $164 thats more then Orion & Gens Ace Lipos.  I think he talking about AA versions For JR & KO transmitters those are  9.9V
http://www.hobbyking...idProduct=38288

#14 Larry

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Posted 04 September 2014 - 04:21 PM

Drop down to a 130 spring, put a good high torque motor in it. My motor from my SR10 is no way going to pull a 150 with anything less than a 11.1, tried it with a 140 (lame). . My stock SR10 shot 415fps for months till it droped down under 400. A 130 may be too hot for a bit to get to you 400fps with .25s.

Edited by Larry, 04 September 2014 - 04:28 PM.


#15 josesoto14

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Posted 05 September 2014 - 06:39 PM

View Posttales, on 04 September 2014 - 01:42 PM, said:

Thats 9.6V $164 thats more then Orion & Gens Ace Lipos.  I think he talking about AA versions For JR & KO transmitters those are  9.9V
http://www.hobbyking...idProduct=38288

this is the one Im talking about, 15c 9.9v
http://www.airsoftme...-connector.aspx

#16 tales

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Posted 05 September 2014 - 10:16 PM

View Postjosesoto14, on 05 September 2014 - 06:39 PM, said:

this is the one Im talking about, 15c 9.9v
http://www.airsoftme...-connector.aspx

are you sure its the battery? I'm with the others, try using a HT motor. If your nimh battery is damaged, lipos are a great choice.

#17 Chuck S

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Posted 07 September 2014 - 03:30 AM

Quote

Lastly, I recommend a low voltage alarm: http://www.airsoftat...ter-p/00565.htm

Don't leave one of these in the gun when not in use:  it will discharge the LiPO battery, you won't hear the beep and the battery will be deep discharged to the point it's damaged and possibly destroyed.

While much more expensive the Burst Wizard King Kong will not only provide a 3-round burst (settable to whatever you want) and a controllable cyclic rate, it will also cut-out the battery when the voltage drops to the danger point.  Prevents deep discharge although it does siphon power all the time in the gun.

The only fires I'm aware of with LiPOs were from quick charging model aircraft batteries.  But I use the fire proof sack when charing mine nonetheless.  I've seen evidence that sloooooooow charging LiPOs is better to retain their life.

-- Chuck

#18 josesoto14

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Posted 11 September 2014 - 07:55 PM

Well i ordered the Lipo, charger and safety bag as suggested...Im also thinking of ordering the Lifepo4 battery for future testing...Ill let you know how it goes!




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