Based on the numbers, I now know I have a pack that charges to about 90% and I can drive 26 miles before discharging the pack way too far.
Looks to me like this battery pack will be fine until next fall........... sure it will be
.
Around April 28, I noticed a drop in performance. I went up to my Dad's in Chatham and back home. I would guess this is about 18 miles round trip. As I was about 3/4 the way home I noticed the voltmeter would drop significantly under load. Something that looked very different to me.
I charged the pack overnight and late the next day took some readings and ran my previous test:
First voltage check post charge:
1-8.40, 2-8.42, 3-8.32, 4-8.38, 5-8.43, 6-8.40, pack-50.3
First SG readings:
Battery number 3 had readings of 1.10, 1.25, 1.25, 1.26
All the other batteries had cells around 1.25-1.26
As I want to learn, I continued my voltage test even though I had a suspect battery....
After a 10 mile ride, pretty much full throttle:
1-8.24, 2-8.26, 3-8.07, 4-8.24, 5-8.29, 6-8.26, pack-49.4
I then did some stuff around the house for 45 minutes or so and headed out on another ride for 10 miles, so after a total of 20 miles my final voltage:
1-8.14, 2-8.15, 3-5.66, 4-8.13, 5-8.18, 6-8.14, pack-46.5
I have now confirmed two ways I have a shorted cell in battery three in the pack by both the voltage after load and the SG readings......
Of course my wife's sisters will arrive on May 6th and the must have a cart, which I am being reminded of hourly and I sure do not want to spend money on batteries before I head home..... Houston, Alan has a problem
