I have always had spare charged batteries as well and like you, dislike Apple for the battery side. John I manged to prize the battery off the glue pad and put the new one in. Instructions say charge the new battery for 4 hours before using, but when I tried the Sat Nav, to make sure it was working, the battery appeared to be fully charged. I am going to charge it for 4 hours just to be careful, but have a gut feeling, I don't really think I need to. I always let the battery run down before re charging.
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