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04 Feb, 2017
Safe battery tender/charger
3 of 3 found this helpful I bought it because my old diesel car didn't start after staying for three weeks in unheated garage (temperatures around freezing). First I charged battery with traditional big current charger but wanted to have something that I can leave safely for extended periods - as I'm cyclist by nature and don't use my car very often.
Behavior of this charger seems to be very correct and safe. First, it checks battery voltage and starts initial charging. Voltage goes up until battery is 100% charged (4 bars on display). Then charging apparently stops as voltage drops to healthy 12,8 volt or so. When I connected charger after long drive I could observe all process going fast as battery was already well charged. This behavior lets me to believe that I can leave this thing on without the danger of overcharging - unlike the simple charger.
P.S. As three weeks for my battery to self discharge seemed to me a bit too short (battery is only three years old) I also checked my car. I found that ground wire from battery had a bad connection (it generated heat) and car didn't charge battery as it should (only 13 v or less). That was the reason for all trouble. Anyway I'm going to use this charger in the winter months as it doesn't hurt to have battery always fully charged while you cycle.