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External / Extended battery options for Dell Precision M7710 laptop (Power Companion)

I'm wondering if there are any recommended external extended runtime battery options for the 7710 series laptop.

I see dell now has some external add-on battery options for longer runtime for the 5510 -- the Dell Power Companion 1800 mAh

accessories.us.dell.com/.../ProductDetail.aspx

but I assume it must not have sufficient output for the 17" 7700 series.

Is there an equivalent product for the 7700 series? I'd like to add 12 hours of runtime for a location that may have a few power outages a year and wouldn't mind buying a couple or few of these devices if there were one which was compatible.

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