View Full Version : Soldering 2 batterys together

02-16-2004, 10:03 PM
I need some advice on soldering (2) 9.6 v 1100 mah nimh batterys together to meet the minimum current required to power my newly upgraded AEG. I found that a large size battery of 3000 mah drives the spring fine. Spring is an M120. I have these 2 batterys that should provide enough current to drive the upgraded spring. Has anyone soldered 2 batteries together to get an additive effect of 1100+1100 =2200 mah? each battery alone just makes the motor clanck inside the gearbox.

02-16-2004, 10:09 PM
Just take the 2 batteries and attach the red wires to each other, and the black wires to each other. That way the battery will still be 9.6V but will have a capacity of 2200mAh. HTH.

02-16-2004, 10:18 PM
Great, will solder them together tomorrow. Thanks for the advice.

02-17-2004, 12:02 AM
The MAH of the battery shouldn't have anything to do with your motor "clanking inside the gearbox."

02-17-2004, 07:58 AM
HTH What does that mean?

The pack needs to be wired in parallel, which will make the capacity additive, whereas wiring it in series will make the voltage additive. http://electronics.howstuffworks.com/battery4.htm

The MAH of the battery shouldn't have anything to do with your motor "clanking inside the gearbox." Believe it or not, when you combine those two packs as he wants to do, the voltage drop that the motor sees will be decreased when under the same load because the larger capacity pack has reserve. Thus, you'll get slightly more power from the 2200mAh pack than the 1100mAh pack, even when they are the same voltage.

At least, I think that is the case.

02-17-2004, 09:18 AM
With an M120 spring it takes a lot more current to get the motor started than it does with a softer spring. A 600 mAh pack simply can't supply the needed current to do this, and when the current drops off, so does the voltage. Basically, the pack is dumping as fast as it can, and all it will be doing succesfully is overheating it's own cells.

HTH = Hope That Helps (Are you a net newb?) :p

02-17-2004, 09:18 AM
a 600 mah battery is hard pressed to put out enough current to turn the motor in an upgraded gun without dumping the battery.

02-17-2004, 09:41 AM
HTH = Hope That Helps (Are you a net newb?) Yes. :p

Did a bit of research:

You would see less voltage drop off at the motor because the internal resistance of the combined packs in parallel would be 1/2 of that of a single pack.

02-17-2004, 04:39 PM
I believe wen he referred to using the one battery it was a 9.6-v 1100mah battery to push the M120 spring, not a 600mah battery.

On topic but on a side note. If I upgrade to 400fps would I have to get a new battery? I have at the moment an 8.4-v 1300mah.

Thanks, B.C.D.:)

02-17-2004, 08:16 PM
OK, soldered the two batteries together and put them in upgraded AEG. Now it works like it it suppose too. I am happy again. Thanks everyone for your input to my problem. I am ready for the OP now.


02-17-2004, 09:56 PM
Glad to hear it came out ok. :)

02-20-2004, 07:57 PM
I run my 400fps Ak on a 8.4v 1300mah and a 8.4v 3000mah NIMH. Both these work fine, but the ROF is much higher with the 3000mah NIMH

02-20-2004, 09:30 PM
Exactly, that's what we were saying earlier. :)