Hi Alex, I don't know what rate he used but asked him and am waiting to hear. Based on the numbers and some advice I'd given him it looks like his rate was around 4.2 amps. That is in the neighborhood of the 3 hour discharge rate. A new battery would deliver about 15.5 AH.
I don't believe he has done a 1/2 CCA test.
Still, he has had a good improvement in battery capacity. RB
We also got better numbers after a few charge-discharge cycles, but when testing the capacity and CCA of the battery, it was never close to new performance. It it is, the battery wasn't that damaged in the first place.
For our amp-hour test we used a Programma Torkel 860 which maintains a constant current drain (varying load as the voltage drops) and a PPI for the load test.
You're right that he'd gain a better gauge of his battery's health by adding a load test.
On the other hand, since Oilheads do undercharge the PC680, and since the 680 then exhibits a bigger starting voltage dip, which has now been seen in several cases, that dip leading to slow, uneven starting, the 4/5 cycle discharge has value.
The winter here was crappy so I kept an eye on my PC680 battery's SOC regularly to see how my own reconditioning was working out. Yesterday I made a cold start after a week of sitting and logged it with the 911. It took 1.1 seconds mid-detent on the Fast Idle Lever, no throttle.
I want to be unique, just like everybody else.
Can you send me a link to the sheet with specifications? It may be possible to fit one directly, though it is a bear of a job to get the alternator out.
A diode is less than $1
My mod has worked for years.
It's all about the details.