I am testing now a Noco Genius 7200 charger.
http://www.geniuschargers.com/G7200
I have a low-capacity Odyssey battery (pc925)for starting duties that went bad (was at ~10.5V and wouldn't charge in the charger's normal mode) which I have revived with the 16.5V "boost" mode and now shows 12.7 V. But we will see in the coming weeks to what extent the battery is actually restored.
Also, my Optima yellowtop auxiliary battery was only holding 12.5V when fully charged. I am also trying the charger with the same "boost" mode for this guy (but it's about 3-4 YO so I guess I can't expect miracles).
I'll try to post any significant future results.
By the way...the has 3 settings and associated voltages for charging duties:
Normal mode is 14.4 volts (but I think there is computer control of actual output with pulsing, etc., based on battery feedback)
"Supply" mode is 13.6 volts without computer control and they claim that in addition to acting as a power supply, this mode is good for recovering low-voltage (like 9 or 10 V) batteries to prepare them for charging in normal mode.
"boost" mode is 16.5V (17V max) which is supposed to actually restore capacity (desulfation) to otherwise damaged batteries.
Contrary to their nice "12 step plan", it does not do all this automatically. You need to do a little sleuthing to determine what exactly is going on with your battery(ies). But it's not too bad; and the manual explains thoroughly enough, even if not with the best organization.
On nice thing: after trying the 16.5V desulfation step, it "checks" for "success"; and if successful (it can take as long as 4 ours to determine this), it goes to the normal smart-chip-controlled charging mode to finish off the charging.
Anyways, I'll try to post up any developments with this charger.
Last edited by Xterabl; 07-21-2012 at 08:12 AM.