According to Todd Andersen who posted on facebook as VP of Sales & Marketing from Zero - "Zero's warranty excludes any damage caused by the use of non-Zero accessories, including chargers".
So, Zero don't warrant any non-Zero chargers including the one that I'm asking for expressions of interest for.
Do you lose warranty on the whole bike if you use a non-Zero charger - interpreting Todd's response above I would say "No".
The proposed chargers are designed to be high power, low cost, compact and lightweight. I would love Zero to offer such a charger and we've been asking them for years for it with little progress.
So, we're just rolling our sleeves up and getting on with it by assembling chargers using high quality commercial components and offering them to Zero owners who want to ride their bikes more. Buyers of this charger need to assess the information we provide about the chargers before they purchase and decide whether there is any risk of damaging the bike. I know that both our chargers and the bike have a number of in-built mechanisms to prevent any damage, but again the buyer needs to make that assessment for themselves.
If we do choose to offer these chargers in future we will reveal more information about the chargers and the commercial UL, EN and IEC listed components that they use.