Not a political post so it will be boring....
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I have these tall hedges around the perimeter of my yard that have to be trimmed down every year. I stand on a ladder and try to keep them at the 8-9 foot level. For this I have a Greenworks G-Max 40v pole hedge trimmer purchased a few years ago. Yesterday the trimmer just stopped even though the battery still showed two bars. I charged it anyway but it still would not start no matter what I did.
This morning I called the company to inquire about it. I didn't have the receipt so they went by the date of manufacture -- 10/17/2016. Their warranty is 4 years. I was out of luck according to the representative. I congratulated them on building the item perfectly to fail immediately after the warranty.
Later I asked my wife where she ordered the trimmer and she told me Amazon so I looked up our purchase history and found it had been ordered 03/28/2017 -- still within warranty! I called Greenworks back and talked to a new representative. They asked for an electronic receipt of the purchase which I sent by email. A few minutes later they came back and told me they are sending a new 40v model with battery and to discard the broken one. I was given an order number and ETA.
Keep your receipts! I usually scan them and put them in electronic folder so I don't have to keep paper receipts. I didn't do that four years ago but fortunately Amazon did.