"First and foremost, KUDOS to reviewer "Skylar M" in 2010 for revealing the great "secret" of this auto-winding AK47 clip! To explain: The auto-winder comes with no written instructions whatsoever! You are left to figure it out and when mine arrived, the only piece that seemed to move was in the opposite end of one of the dual clips that has the 2 fake bullets but when I opened that slide-off top, I was convinced I had a defective auto-winder because while the battery pack could neatly fit in there, there was no separate wire to 'connect' the battery pack!
Then, through pure luck and researching the auto-winder on the internet, I came across the review of Skylar M and the "secret" that those two fake bullets themselves are slide-off moveable and, ahhhh, THAT is where the battery pack goes [after you slide-off the fake bullets!] and where the battery pack connector wires are located! As I say, with no instructions of any kind, you're on your own to figure it out, find it by chance or hopefully read about it from a savvy reviewer [Skylar M] who thankfully mentioned it in his review!
So too, the 4.8 battery pack has no markings whatsoever as to its milliamps per hour [mAh] rating and, of course, nothing in the way of how long to charge the battery! As you know, over-charging a battery pack of any kind can 'greatly' weaken it prematurely. Generally, you take the milliamps per hour [mAh] of the battery pack and DIVIDE that by the charger amperage but when you don't know the milliamp per hour rating of the battery pack, that could be a problem! On the other hand, most of those included battery packs 'generally' run about 1100 to 1200 milliamps per hour rating [although I just ordered a "back-up" 4.8 volt NiMH battery pack with a rating of 2000 mA], so, if you assume that the included battery pack is perhaps 1100 mAh and you 'know' the wall charger [which 'is' marked] is rated at 250mA, you should charge the battery pack no longer than 4 hours at the max!
As for the space on the other end of the clip that has the fake bullets, the only thing I can think of is that this is an area to store additional 6mm BB's since there is no connection between the joined clips and only one of the clips actually holds the 6mm BB's that are to be fired. If I'm wrong on that, please comment!
One good thing too -- if the battery pack fails and basically runs out of juice, you can 'manually' wind the wheel at the bottom of the clip with your fingers to keep going until you have a chance to re-charge the battery pack.
WHY no written instructions whatsoever is not included with this AK47 auto-winder escapes me completely! Ditto the battery pack with no voltage nor mA markings/ratings whatsoever! Go figure!"