I bought a battery tender p/n 081-0158. and it stated
Input: 12v
Output: 5V 2.1A
this only sucked my Motorcyle battery dry. I spent 2 hours connecting various plugs and USB connectors to try to send current to my bike, but nothing worked.
CRAP read more
My Battery Tender (021-0128) that I purchaced off Amazon in Dec 2022 failed for an unknown reason. I talked with Loretta at Deltran and she quickly set me up to get a replacement. The replacement would carry the remainder of the 10 year warranty. All I had to do was send her a picture of the product with the wires cut and a copy of my receipt which I got off from Amazon. Very Easy! read more