Spare batteries - third party battery - where to buy (and how long will they be available)

[davez]

Are there third party batteries available for the Levo? Does anyone have a good source besides the local dealers. And did Specialized ever communicate how many years the batteries (and engines by the way) will be available as spare parts? Looking at my consumer electronics products, in most cases the batteries are significantly weaker after two years and latest after three years I need to replace them.