While about a third through a long distance road journey my alternator failed. A garage replacement or full UK recovery was not possible inside a week as the town was to shut down next day for an annual festival and thereafter there were National holidays for a week to a month?Chosen option was to charge my battery and head for home. Fortunately I had recently fitted an excellent Yuasa 5000 series 80a/h battery. Unfortunately there was no equivalent to ‘Halfords’ to buy a suitable charger from. I eventually found a motorist shop where the ‘best’ they could sell me was a Noco Genius G3500 charger - a 3.5 amp charger.I was apprehensive because this suggests a charging time of around 23 hours. Basic physics states for a charging time divided the charger output into the battery capacity – e.g. 3.5amps into 80amp/hours = @ 22.86 hours. A 10 amp charger would do it in 8 hours. However, the packaging and the manual both state the G3500 is a ‘2X’ charger, using special technology to charge twice as fast. The manual states 80amps of charge in 11.5 hours.I needed this as [a] I had to set out early next day to drive in daylight and not have to run lights, and [b] I didn’t want a second day/night in the hotel for £100.12 hours later my battery was only showing half charged. I waited as long as I could/was allowed in the hotel lobby and even after 4 more hours the battery charge was only nudging 70%. I should have known; “You canny change the Laws of physics.”
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