Wand posted this on another prop board in December of 2014.
Mods - please let me know if posting this quote is an issue.
“It won’t be easy to replace – the housing is ultrasonically welded shut, and the battery is a custom-made one so you wouldn’t be able to buy it anywhere. However, the battery should last pretty well – it’s rated to hold 80% of its initial capacity after 300 charge/discharge cycles, and we expect that for “average” usage, the product will run for around 5 days between charges, so the battery should reach this 80% point after around 4 years and still be perfectly usable after 10 years. Of course, most people won’t continue to use the product every day for years, so it’s unlikely that they’ll ever “wear out” the battery.”