I looked to the cause of why Battery 4 of my 48 volt Electric Propulsion bank was not charging properly. Since the terminals for this battery can best be accessed by the starboard locker hatch I first had to empty out the locker and then squeeze my large frame down into it.
Taking off the protective caps on the negative terminal I had quite a bit of corrosion on it.
This was because I had become somewhat complacent in checking and cleaning the terminals. Mostly because up to now the battery charging had been operating normally. The failure of battery four just happened a few days ago. After cleaning the terminals I used an battery tester to check it:
The readings above show a voltage of 10.87 volts and an internal battery resistance reading of 196.2 milli ohms. Which is a much higher resistance reading than when I last checked it on February 12, 2012.Which was 2.43 milli ohms. So obviously something had changed in this battery. I will try a few more attempts at charging but, I don't think things will approve much. TO BE CONTINUED.