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lipo or lithium polymer is usually smaller and has a longer life and take around 1 hour to charge but need replacing every 2-3 years and you need a balance charger
depends if its a standard m4 stock then you will need a 7.4v stock tube lipo but if its a crane stock then a 9.6v NiMH nunchuck battery will be a good choiceis a collapseable stock so it would go in the stock tube.Its Finius' M4 on page 16 gun picture thread if it helps
you can find them pretty much anywhere just look around