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Just insure that you charge it on a semi-regular basis so that there is no fear of it taking a charge when it replaces your other unit. I have a spare as well and charge it at least once every three months at the most and it work fine. That unit is always in sleep mode.
I also bough another unit as a present for someone today for $98.00 in the states and if it does not work out as a present then I will regulary charge that one as well.
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