Noco genius charger issue study

[ontarioyamaha]

Initially I believed I had a failed battery in my RS. If so it would have been 3 Yuasa in three years. I charged with Noco until green and within a day the battery would be dead. I charged it with a second Noco with the same results. I was going to change the battery but decided to do a study. Fully charged on Noco it would only go to 12.51. Which yes is considered fully charged. Within 3 days it would drop to 12.14 which is considered dead. I fully charged again with an old school trickle charger. It went to 13.72. load test showed good. Charged again to 13. 7 and with it on the bench it remained fully charged for a week. It basically drops .01 volts per day.

Conclusion Noco chargers were the root cause of my issues and I have probably turfed 5 batteries in my equipment needlessly.

Note. I also thought I had a Voltage leak on the sled spent a lot of time trying to solve it. At the end I put in a battery disconnect to alleviate the drain until I could figure it out. I am thinking now I never really had an issue so I am going to perform the same study this week with the disconnect turned on.

Next step I will charge fully and leave connected in sled and perfom a daily Voltage test.

Study data

Charged with Noco ‐ Green light full charge

12.53 volts Friday at 11am
12.18 volts Sat at 11
12.15 v Sunday
12.14 v monday
Would not start

Charged 24 hours
Load tested and it went down to 11 volts
9 volts is bad 11 is top of weak scale

Charged with small charger
Unhooked and read 13.71 volts

Time study on bench (12.5 to 8 is full)
Specs
12.51V - 12.57V = 75% charged
12.69V - 12.75V = 100% charged

13.05 Friday after 3 hours off chargers l

12.96 Sat 3:30

12.94 Sun 10:00 am

Installed in sled 1:00 Sun 12.94 volts
Disconnect turned off

12.93 Mon 7:30 am

12. 91 Tues am (still Disconnect)

12.89 Wed 4:00 pm

12.89 Thursday 8:00 am

12.88 Friday 9:00 am

As a side note - 14 out tested mxz and it was 12.12. Started but barely

12.87 Sat 8 am

 

[RobX-1]

Noco or Novo?

 

[ontarioyamaha]

Noco