Any of you guys that have a lot of experience I really need some help from. I just bought a KWA SR-10 used (Great Condition) Shoots great. And I bought a used M249 SAW Para version by ECHO 1 The M249 came with a 7.4 Lipo battery. I decided to hook it up to my KWA KM4 SR-10. The trigger response and rate of fire is amazing! (I can put it in my KM4 because it's to wide for the crane stock) I realize that lipo batteries can put more stress on your gear box but I'm sure it takes a long time if you are not blasting it on full auto all the time. What I would like to know is how long will a 7.4 Lipo battery (Random "Normal" mAh) last me on the field at a milsim event for 2 days? How many Lipos do I need to take? I would love to know. also what mAh would yall recommend and this thing called a "C" rating. Still confused on the C rating. And just to kill 2 birds with one stone How many Lipo batteries will I need for the M249 (Since it's fully auto only)? I plan on bringing it too. If you're interested in the event I am going to it's Operation Black sheep. The one event being hosted in Perry GA at the Guardian Center. Thank you and have a great day!