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Yes, I've been using the M9941 precursor with no adjustment for over 2 yrs without issues. I take care to keep it off wet ground and covered from dew if at a dark sky sites, but at home its happy sitting on the tiles under my mount.
Bought originally when I was fretting that my battery may not be behaving all night. If you know you'll have access to 240V well worth having something like this.
Decent gel battery and charger or even a Jumpstart pack will set you back way over $100
I did invest in batteries, but if you eventually get into astrophotography you start having dew heaters, laptops, cooled CCDs and all sorts of things that can require SERIOUS juice. I sometime wish I'd confined myself to 240V sites and spent the money on more filters or another DSLR lens.
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