21 replies to this topic

[aaps59]

Yay a new video!

[gcw360]

Allizard, on 22 March 2012 - 06:10 PM, said:

Awesome video!

[kwaispro727]

If your using say a 20C battery instead of a 15C battery, will the motor heat up noticeably?  I'm becoming scepticle.  My Lipo doesn't say on it how man "C"s it is, and I don't exactly remember if it was 15 or 20.  I'm pretty sure it is 15C (mine is 1800mah), since it's 1600mah counterpart is 12C.  But that probably isn't really a good way to gauge it.

[niko_gpsy]

[kwaispro727]

niko_gpsy, on 23 March 2012 - 03:48 AM, said:

I watched the video.  Talking about the C rating was what brought the question to my mind.

[Trevytrev]

Wait at what point will the lidos be damaged?chow would you know? ( sorry I don't know about AEG ) so how long will the split batteries KWA stock in the shop last then?

[niko_gpsy]

If you allow the lipos cells to fall below 3.0V it will get damaged. Also I can't stress enough the importance of a good balance charger. I have seen more people damage their batteries from bad/cheap wall chargers than dropping it on the ground.
And if you take care of your batteries it will last you a very long time. I still use lipos that I bought 2 years ago.

[kwaispro727]

Gotta love the Thunder AC6.

[Trevytrev]

Thanks, and yeah I was told yesterday about the wonderful ac6 charger

[Turranx]

If you are going to invest in a Lithium style battery, may I recommend that you invest $16~20 in a battery monitor such as the BM6.  http://chargery.com/cellMonitor.asp  This gizmo attaches to the charging header on a Lithium battery and warns you (with a loud buzzer) when the battery drops below a threshold that you have configured (2.00V to 4.00V).  I was using my SR12 with a new LiFePo4 3S 9.9V 1100Mah (using A123 18650 cells) and coupled to a BM6 battery monitor.  I stopped using the battery when the buzzer went off.  After the recharge was complete, I saw that the battery took a 1000mAH charge.  I was nearing the end of its usable capacity, but because of the nature of Lithium batteries, the trigger response was still snappy.  If the battery monitor had not been attached, I'm sure I would have pushed the battery well below the minimum 2 volts per cell threshold and damaged it.

I can fit a 3S LiFePo4 battery pack, the BM6, & ASCU v2 mosfet all in the SR12 stock with room to spare.

[Cerveza]

11.1 and 15C is great information, and the sizing numbers helps a great deal in selecting batteries. What the video omitted is what the maximum mAh is for KWA products? Since the guns come with a 20A fuse, I guess it's safe to assume 20A limit?

Convert the Mah to Amp Hours by dividing 1000 into the Mah. Then just multiply the Mah by "C" rating and that's the constant amperage.

15C * 1.3 = 19.5A

According to this the largest 15C mAh that should be used with a KWA would be 1300 (actually 1333 )

20C * 1 = 20.0A

And using a 20C battery with 1000 mAh would be max.

This confuses me though, because the LiPo's in the KWA store are above these numbers.

11.1/1400/15C which is above the 1300 limit. AND this batteries picture shows 1600mAh?
11.1/1800/15C which is WAY above the 1300 limit. AND this batteries picture also shows 1600mAh?

So is the mAh not that big of a deal?

[kwaispro727]

If you google BOL 1800mah 11.1v Lipo you come up with batteries all the same size and shape that are 1800mah.  If you google BOL 1600mah 11.1v lipo you come up with nothing BOL related.  So I'm convinced the one in the Pro Shop is 1800mah not 1600, although the rapper says it's 1600.
But I honestly don't see how the mAh matters that much.  I would think just the discharge rate and voltage would be all you need to worry about.  I always thought the mAh (aka battery-life??) had nothing to do with how MUCH power is being discharged, but rather how LONG it will keep producing it.
I'm getting more and more confused by the day...

[niko_gpsy]

But Mah and discharge rate is factored in when calculating the amount of capable current so how do you not see that Mah matters?

[kwaispro727]

I don't understand why it factors into the max. discharge current.

[Cerveza]

I'll ask again. Hopefully to get an "official" KWA response.

What is the maximum mAh for an 11.1 LiPo (15C discharge rate) for use with KWA guns?

Assuming a 20A limit, it would appear that the maximum mAh would be 1333mAh as demonstrated in my post above. If that's not right, please provide some links or explanations. I really want to use LiPo batteries in my KWA guns.

Could we get an official response please?

[kwaispro727]

From posts by mods on the forum that I have read, the maximum recommended amps is 25 (15C 1600mah 11.1v Lipo = 24a).  Apparently, that will change depending on the C rating.  Lower C = more mah.  Higher C = lower mah.  I also read somewhere on the forum not to go over 25C.

I think it's just a bunch of hokus pokus.  Everyone I know, every video I watch, people use largely out of spec batteries.  I mean like 15C 1800mah batteries up to 20C 2400mah batteries.  All of the guns are fine.  My advice - stay at 15C, and buy batteries that will fit in the battery compartment without modification.  If you do that, they won't have too many mah.

[aaps59]

kwaispro727, on 10 April 2012 - 10:39 AM, said:

buy batteries that will fit in the battery compartment without modification.  If you do that, they won't have too many mah.

Im with you there bud! It was pretty hard for me to find a decent lipo for my crane stock on the SR10. Im thankful I was able to find some decent batteries for my Magpul ACS stock that could fit in the buffer tube. With the help of Desert Punk of course

[niko_gpsy]

kwaispro727, on 10 April 2012 - 10:39 AM, said:

From posts by mods on the forum that I have read, the maximum recommended amps is 25 (15C 1600mah 11.1v Lipo = 24a).  Apparently, that will change depending on the C rating.  Lower C = more mah.  Higher C = lower mah.  I also read somewhere on the forum not to go over 25C.

I think it's just a bunch of hokus pokus.  Everyone I know, every video I watch, people use largely out of spec batteries.  I mean like 15C 1800mah batteries up to 20C 2400mah batteries.  All of the guns are fine.  My advice - stay at 15C, and buy batteries that will fit in the battery compartment without modification.  If you do that, they won't have too many mah.

It's not all hokus pokus............................... Extremely high output batteries DO fry electricals without a protective circuit.

[R_King91303]

aaps59, on 10 April 2012 - 10:49 AM, said:

Im with you there bud! It was pretty hard for me to find a decent lipo for my crane stock on the SR10. Im thankful I was able to find some decent batteries for my Magpul ACS stock that could fit in the buffer tube. With the help of Desert Punk of course

The video was very informative and eye opening. It never crossed my mind that you could fit a brick style lipo into the crane stock.


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