KA M4: Stock Lipo Ready?

[M.Garcia]

Does anyone know if using a 7.4v 2000mah lipo will do any damage to my stock KA M4? I have zero experience with Lipo and apparently it is the new standard.

Do different Lipo batteries have more power then others? I have zero knowledge of them. I've been trying to locate some information but haven't found anything to answer my question.

[ThunderCactus]

How hard did you look? lol
http://airsoftcanada.com/showthread.php?t=99899

The C rating on the pack will make a bit of a difference. If it's too low, the pack won't be supplying the motor with enough current, and may cause the pack to fail.
C ratings above what your motor needs will increase power very slightly due to reduced internal resistance in the pack, BUT it's a small difference.

You CAN run pretty well any AEG off a 7.4v LiPo, and that LiPo thread should have all the other info you need

[M.Garcia]

Ok thanks for that!

[XZIVR]

Just make sure you understand how they work in terms of charging and discharging (use) so you dont catch your gun on fire and/or burn your house down.

[phloudernow]

C rating is a big deal, too high will kill your trigger contacts

i had a 35c 7.4 lipo for my KA before it burnt out my trigger a couple games later,

in my experience theres nothin as lipo ready, its just how durable your gun is in order to take a lipo battery

read the lipo thread, you should have at least an upgraded piston and whatnot to run lipo

[M.Garcia]

Ye so I'm looking into the charging stuff right now and figuring it out. One thing that is now confusing me from the post Thunder gave me is this MOSFET thing (still yet to research) and if my internals are going to be sound. Some people have indictaed that some things need to be upgraded such as the piston.

[phloudernow]

Originally Posted by M.Garcia

Ye so I'm looking into the charging stuff right now and figuring it out. One thing that is now confusing me from the post Thunder gave me is this MOSFET thing (still yet to research) and if my internals are going to be sound. Some people have indictaed that some things need to be upgraded such as the piston.

the idea of a mosfet is to control the current flowing through the gun, it prevents too much current going into your gun thus preventing damage. more advanced mosfets also improve trigger reaction time as well as letting your gun complete a cycle even with the slightest pull through active breaking.

the ideal lipo battery you should be using is 15c or 20c lipos even with a 7.4 it will still break after maybe 6 or 7 games something is bound to give in especially your trigger contacts without a mosfet

[M.Garcia]

Originally Posted by phloudernow

the idea of a mosfet is to control the current flowing through the gun, it prevents too much current going into your gun thus preventing damage. more advanced mosfets also improve trigger reaction time as well as letting your gun complete a cycle even with the slightest pull through active breaking.

the ideal lipo battery you should be using is 15c or 20c lipos even with a 7.4 it will still break after maybe 6 or 7 games something is bound to give in especially your trigger contacts without a mosfet

You had me until the bolded part.. Did you just say things in my gun are going to break after that many games without a MOSFET? But with a MOSFET I will be fine?

[lurkingknight]

there's no such thing in the real world as lipo ready imo. your gun will break whether you use a lipo or not if you don't take proper precautions.

The 3 biggest things you need for lipo to run a gun are proper shim job, proper AoE correction on the piston and mosfet. A 7.4v 20c lipo will give you similar rof to a 9.6v 1600mah mini. And these 3 things are something I personally do to every AEG I own now and in the future as a matter of precautionary maintenance, lipo or not.

shimming and aoe are recommended for any gun, shims to make sure gear engagement is good and consistent, AoE correction to make sure the gears engage the piston at a good angle to distribute the shock load on the pickup tooth.

The basic mosfet will reroute the power system so that max current isn't cranked through the mechanical trigger switch on the gun, which if not there will arc when the trigger is pulled. Higher discharge/current battery means more arcing and the contacts will corrode/burn out.


Beyond that, what you need for lipo is an understanding why not to fuck up the care of the batteries as you use them.

[M.Garcia]

Ok this makes more sense.

Could you elaborate more on AoE? Not sure what it is. I can Google it but do you have a good article you would recommend I read for it?

[phloudernow]

Originally Posted by M.Garcia

You had me until the bolded part.. Did you just say things in my gun are going to break after that many games without a MOSFET? But with a MOSFET I will be fine?

haha sorry about that, but without a upgraded piston you might shred your piston, also most likely without a mosfet your trigger contacts will most likely burn out and this is from personal experience

also yeah what lurkingknight said, thats the idea of the mosfet. as i said in my previous post, a battery with a high C discharge rate will killl your trigger contacts faster maybe even after a few hundered rounds

[M.Garcia]

Originally Posted by phloudernow

haha sorry about that, but without a upgraded piston you might shred your piston, also most likely without a mosfet your trigger contacts will most likely burn out and this is from personal experience

Ok understood.

What would you recommend piston wise?

And so with mosfet it will prevent burning of the trigger contacts regardless of C rating?

[phloudernow]

Originally Posted by M.Garcia

Ok understood.

What would you recommend piston wise?

And so with mosfet it will prevent burning of the trigger contacts regardless of C rating?

Thats the general idea, however to be on the safer side i recomend using batteries with a rating under 30C, usually 20C lipos are the safest to go to, i use 15C 11.1V lipos too.

Piston wise the best pistons on the market in my experience as well as many other people might agree on is the Prometheus Hard Piston. I have yet to see one break. Ive been airsoting for quite a while and have not seen one break. if something does break its never the piston.

those things are built really well. currently run one in all my guns

they are quite pricey compared to other pistons but i think its worth it. Prometheus/Laylax make some of the best aftermarket internal parts. even their gear sets and inner barrels are amazing

[lurkingknight]

the key to not shredding a piston is keeping the entire assembly as light as possible. I've read some guys using polymer tooth/hull pistons and not breaking at all with proper AoE adjustment, and polymer pistons with steel rack teeth with 2nd and 3rd teeth shaved.

read up on AoE by searching Angle of Engagement and stretch your googlefu muscles. There's plenty of resources out there that explain how to do it properly (and better than I can explain)

[Stealth]

It depends on your performance goals. A $50 Prometheus hard piston in a sub 400fps, low rate-of-fire build is just overkill and a waste of money. 1/5 of the value of your gun in a consumable part? haha.

Any piston will get "shredded" if not installed correctly - prometheus included. Installing a sorbopad will almost instantly fix your Angle of Engagement problem. I'm restocking these in my store later this week.

You should upgrade your piston if you're going above 400fps, 20rps or both. And even then, there are cheaper alternatives than the Prometheus. Don't go rushing off to buy parts until you know what you need. Your stock piston should last a while if you do the proper preventative maintenance.

Once you're ready to buy a new piston, read this:
http://www.airsoftstore.ca/index.php...jqgk74shqrubf7