My T3 runs 1.1.00.15210 and that includes the Kobo bookstore. I get no battery drain at all. In fact, I picked up my T3 this morning. It'd been off for a good 6 weeks so had shut itself down. When it booted up, still had a full battery charge.
I'm sure my Nook HD (and the HD+) that I haven't turned on in a couple of weeks both have dead batteries.
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