Question # 2:
I also have a battery pack left over from my Tokyo Marui Mp5a5 (Not sure, but I think it is 'mini'). Would this be useable inside the Aftermath Mp5 as well? And, Would charging this battery with same charger as above be safe? It's a yellow pack with 7 'sanyo Cadnica batteries' inside.
You can try it yourself, ya know? If it mini it should fit, but why dont you try it yourself?