Quote:
Originally Posted by Mike Dabrowski 2000
I have been experimenting with a two step charging system that would allow a full charge on an empty pack in 5-7 hours while still allowing a 350ma finishing charge.
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Granted I'm not the average user, but couldn't you make one that charges significantly faster? For example, 6 amps primary charge would draw about 1100 watts and take about an hour to get to your secondary step.
I currently charge batteries before they ship by using ten chargers at their max of 6 amps for 12 cells each (and their power supplies draw a max of 110 watts each). It takes about an hour from empty with an average pack to reach delta V and then I have them set to apply a 350 Mah trickle charge for one hour after that to make up for any variations between the chargers.
With the fan on, the cells stay cool.
In fact, with the fan running at 9V or more they will stay cool if discharged at 30 amps.
Two hours - I can have it in a crate in time to make my UPS pickup.
Five-Seven hours - I can't.
You might find this interesting:
I'm getting one of these made for me right now.
It is a tester that tests charge and discharge performance and internal resistance at up to 50A for a twelve cell stick pair (Gen II batteries).
Here are two shots of how these commercial units are made:
http://hybrid-battery-repair.com/bt2.jpg
http://hybrid-battery-repair.com/bt3.jpg
