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I have the same drive and 4D cell power pack. I found a pdf and said 20hrs to a set of batteries. A Dolphin battery is also 6v and will last a little longer.
To get longer and rechargable get a 6v sealed lead acid battery from the likes of Jaycar. I have a bike headlight running the same battery. You can use a 6-7.5v plug pack to recharge it.
Hope that helps.
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