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The Gel cells in most field batteries shouldn't be drained below 40-50% of their capacity. This means that a 17Ah battery really has a useable capactity of about 9Ah. Assuming that the LX90 pulls 1 AMP, that would give you 9 hours of use before the battery should be recharged. I think the LX90 pulls about 750mA, which would extend your time to 12 hours.
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