This would doubtless void your warranty, so proceed at your own risk... <Madly rolls eyes like a slot machine for several minutes>
I'd shut it off. Run your thumbnail or a blunted plastic tool intended for separating cell phone cases around the edge between the back cover and body to separate the case. Remove the back cover. If the battery is not stuck fast, stick it fast if the adhesive is sticky or use a piece of 3M double sided adhesive tape to reattach it and close the case.
You might be able to soften whatever adhesive they used with a tiny bit of lacquer thinner or acetone... but, the 3M double sided adhesive tape is simpler, and probably reversible and you might well cause other problems unless you know exactly what you're doing spraying chemicals around.
There have been a number of posts regarding this issue, so you're not alone. That said, my Glo's battery seems to be stuck down quite well.