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A very good price for this battery- has an RRP of $99, can generally find it for around $76 if you look at Ribble, Chain Reaction, etc.
At this price can afford to keep a spare on hand!
I did have one completely fail when I was in Thailand recently, after around 9 months of use. Had to get one shipped from Shimano in Bangkok, and was very expensive. Hopefully someone will find this useful, if you are cycling freak like me!
I have no opinion on the deal, but how long have bicycles been semi automatic? Very cool stuff.