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Not quite right. New, fully charged SLA 7AH battery will have 13.8V and therefore will push higher current to your equipment. In most of cases it will not do any harm, but you better check specifications for your telescope. If it says 12V +/- 10% it is usually OK to use SLA battery. Another thing to keep in mind is that it is very easy to reverse polarity and do serious damage. Wire power diode (1N4004 for one ampere or 1N5404 for 3 Amperes) in series in connection to your telescope. That will give you reverse polarity protection and the diode will drop up to 0.7V bringing voltage from the battery closer to 12V
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