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That is probably asking too much. If you do it right, you can probably get close to six hours of total run time but not if you drain all the way. And I wouldnt use Ni-Cad, they dont last nearly as long.
What I do is use NiMH batteries....
1.Charge before leaving
2.Drain above charge to 40% - 1 hour
3.charge/use on Extender - 1 hour
4.drain charge to 40% - 1 hour
5. charge/use on Extender - 1 hour
6. drain charge to 40% - 1 hour
7 charge/use on Extender - 1 hour
8. drain charge to 40% - 1 hour
So you could probably get almost 7 hours total....maybe. I just depends what your using it for. You can usually get 3 full charges out of a full set of NiMH batteries. Also, all that time the battery is on low. Check with Semson for any other specifics.
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