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Whilst the no-load voltage of fresh alkaline batteries may be alright (somewhere around the nominal 1.5V), under load, that voltage drops fast. Driving a high-power device like a motor will drain the batteries quickly, but more to the point, the internal resistance will climb very fast and the first thing you should notice is a drop in the loaded voltage, although the battery will still have a fair bit of life left in it - fine for torches and portable radios, but not for much else.
The voltage drop may be sufficient to fall below the minimum required for the LX90 mount.
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