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Its always good to have a spare battery on hand, better than going out and buying it at radioshack, cause the one at radioshack doesnt come with the O-ring and grease that is vital to keep water out, I deffinitly recomend original equipment parts, and always haveing one on hand, cause it sucks when the screen comes on and says low battery and you are in the middle of knowhere in the Atlantic Ocean.
I use this little baby to download all my dives and store them on my computer, takes the hasle out of going through all the screens on the dive computer to get to one particular dive. I love it, Plus this was the cheapest place to get one, rather than the local dive store.
Havent had to use this stuff yet, but I have a friend that has and he says that it saved his life, Sucks when the boat leaves with you still in the water, this is one safety Item you should not be without.