Battery question

[m4a1sniper]

Hey Guys i have a Tokyo Maryui M4A1 R.I.S and i was wondering what is the largest 8.4v battery i could put in it without recking the gearbox.i have not done any upgrades on my m4 it is completely stock. I read some threads on the size of batteries but couldnt get a clear answer could you help me.

[ILLusion]

1700 mAh

[m4a1sniper]

So a 8v 1700 Ni-mh. would a 8v 2100 Ni-mh be pushing it.

[m4a1sniper]

My friend got a sto ck TM fa-mas and they sold him a 8.4v 3000mAH is this right if so why cant my gun handle it.

[k2x5]

Think of electricity as a tank of water.

voltage -> Pressure (too much, and the pipe will burst)
mAh -> supply. Mre supply will not have an adverse affect, it'll just be there when you need it. However too little, and you wont make it through a game.

Higher mAh will not damage a gun, or any electrical equipment for that matter. Too high a voltage WILL. If the voltage rating is right, then get whatever mAh will fit into the space you have.

cheers./

[m4a1sniper]

so a 8.4v 3000mAh should be good for my m4. another question my batteries is a 8.4v 600mAh and it sais it has a discharge of 10A and my friends 8.4v 3000mAh and on that battery it sais it has a discharge of 25A, what will this affect?Some people told me a 3000mAh will increase my rate of fire and reck my stock gear box is this true.

[kuchervano]

The mAh rating is the quantative rating of how many miliAmps per hour the battery can supply. The larger the capacity, the more amps a battery can output, longer. A high mAh value will not make your gun shoot faster or the motor draw more power.

[m4a1sniper]

But since there is a higher output rate the motor would draw more power and doesnt that increase rate of fire.

[Mantelope]

Originally Posted by m4a1sniper

But since there is a higher output rate the motor would draw more power and doesnt that increase rate of fire.

Go read some basic electical background before you start making assumptions. A good place to begin: www.batteryuniversity.com

[ILLusion]

This has been discussed in the past.

In THEORY, higher mAh does not affect rate of fire.

However, in practice, that is not the case. Why? Because of different cell structures.

Higher capacity cells have lower internal resistance than smaller cells. Lowered R with same V means higher I supplied. Basic Ohm's law. A higher capacity gun won't PUSH the gearbox to go faster. The gearbox will just use the available power to it. A stock gun is designed around a specific battery pack. Tokyo Marui suggests 1300mAh sub-C packs for optimum gun life for it's stock guns. Experienced tuners in Asia would not recommend much beyond that and don't even recommend going to full 2400mAh packs until you at least break the 350fps barrier.

Case in point: Take a stock gun, put in an 8.4volt 600mAh nicad mini pack. Fire full auto. Note the rate of fire.
Now take an 8.4 volt 2400mAh nicad sub-C pack and fire in full auto. Notice the rather drastic increase in the rate of fire?

Also, notice how after prolonged use (especially in an upgraded gun), the mini battery increases in temperature faster and higher than the large pack? That's because the increased resistance has to let off that wasted energy somewhere. It comes out in the form of heat.

What you're all reading on paper is fine and dandy: Yes, higher mAh means your gun will last longer. But you need to take into consideration other physical aspects of the cells.


Will the increased ROF of a 2400mAh sub-C pack on your stock gun damage the internals? Yes and no.

If you do a lot of full auto fire, the sector gear will come spinning around constantly at high speed. The stock spring may not be able to keep up with the speed, and the sector gear's teeth will end up raking the piston teeth before it has come to rest. I've personally seen this happen to a user's gun and it resulted in a chewed up piston and sector gear. This happened after less than one season of light play.

However, if you do a lot of semi-auto fire, there should be very minimal damage to your internals.

[hutch1970]

I use 11.1 volt 10c 1250mah li-poly.My spring is a 120 with no other up-grades.I use a ca33e.Extreme rof.NO probs thus far-over ten thousand rds. Except....it hurts like hell(350 fps).I don't/won't use less than m120 spring-too high rof. >25 bb's and tight-bore help mucho w/ accuracy.I recommend highly you research my info before using anything I said.Li-poly batts are for experienced player's only! You must understand their properties to use them correctly.An xtra bonus is their size-much smaller.Fillipino airsoft discusses them quite a bit-check it out.P.s.-they are also pretty cheap on the net.Mine cost $27 w/ shipping-Later.

[LUTNIT]

I've always used 8.4V 3000mAh large (Sub-C cells) in my stock guns and nothing has happened. I've heard of some guns really screwing up because of batteries that are too big but these aren't common. I also don't whore ammo out of my guns.

Use a larger capacity battery in a stock gun for short bursts theres probably no problem at all but if your firing on full auto for extended periods of time there is a higher chance of the gun breaking. Still not too common but if you don't have much spare cash to spend it may be better to go the safer route just in case, your choice.

To give an example of rate of fire based on mAh my 7.2V 4200mAh pack has a rate of fire pretty much the same as my 8.4V 3000mAh packs. Both provide a very distinctively higher rate of fire than a 8.4V 1700mAh pack.

[Viper20]

Ill get in on this action too, I have a P90, uses a 8.4 V, what MAH should I be looking for?

[Renegade)]

Depends on how heavy your finger is... If you shoot alot, get a higher capacity battery, if you can control your game, 600-1200 should be fine. With upgrades go 1700+ to compensate.

[Greylocks]

For those of you still learning, there is also a HUGE difference between a 'mini' 8.4 volt 1200mah and a 'large' of the same rated power. Both use different sized cells, and the 'large' (which fits inside the full stocks of the larger guns) has a LOT more capacity for power, abuse, speed of charging, and duration.

There are also limits with some gun models about exactly where you can stuff a battery inside.

So study the models you want to buy, or already have, carefully.

There is no reason why a normal battery, in a gun that is not insanely upgraded, should not last an entire gaming day unless you shoot like a nutcase.