The recommendation for storing Li-ion cells is as at 40% charge in a cool dry place. Sealed in a bag in a fridge (not freezer) is good. You need to check the charge level occasionally as the cell will self-discharge and you don't want it to drop below 0% charge.
I don't know what the best way to store a device like this. I would consider opening it and disconnecting the battery after getting it to the right charge level. I'd probably also use it for a few days just to make sure everything was OK before storing it.
But, I'm a little baffled. If your current Glo HD has a cracked substrate, why aren't you changing to use the new one?
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