[wattsy]

The idea that the M8 might have a 20 year life is, frankly, ludicrously optimistic. I'm pretty surprised mine is still going after just two and half years. The M8 strikes me as simply too prone to component failure over the medium to long term to think it'll still be viable in 2030. Even if something goes wrong with my M8 tomorrow (let alone in 5 or 10 years) I'm not entirely confident it'll be economically sensible to repair it.

With the way energy prices look set to go long term, I'm worried less that the batteries will be around in 20 years than I am that I'll be able to afford to have electricity to charge them.