I have the LS91 model and it tells you in the instructions what you need to do to get the extra time. Essentially you need to reduce the brightness to -5. This dulls the picture but if you are in a low lit room then it's no problem. To do this for this model you hit monitor mode twice and then reduce the brightness.
Cheers
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ye i have the same broblem youre supposed to get six hours on full battery but i only get about 2 and hlaf can you ehlp me
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