Thank you Shaver Shop. What fantastic service! I spoke to Andy (Hyperdome store) on the phone - she was very friendly. I went in today & Andy replaced my WAHL Lithium Stainless Steel cordless beard trimmer with a new unit. It was 2 years old & wouldn't turn on - turns out to be a failed charger.
Even better the new replacement has 2-year warranty from today's date.