Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post

MetroMPG · 06-21-2009, 12:23 PM

Fun!!

The Exide that blew probably already had a weak cell. The cell reversed polarity when its voltage was drawn down low enough, with the result that current passing through the battery began charging that cell.

That explains why it was bubbling furiously - you were probably stuffing a lot of current through it. Maybe 75 amps? 100?

It makes sense that removing that battery from the string made things go faster, because you effectively took a big battery charger/resistor out of the loop!

06-21-2009, 12:23 PM	#22 (permalink)
MetroMPG Batman Junior Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,534 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 54.46 mpg (US) Appliance car Mirage - '14 Mitsubishi Mirage ES (base) 90 day: 57.73 mpg (US) Thanks: 4,082 Thanked 6,979 Times in 3,614 Posts	Fun!! The Exide that blew probably already had a weak cell. The cell reversed polarity when its voltage was drawn down low enough, with the result that current passing through the battery began charging that cell. That explains why it was bubbling furiously - you were probably stuffing a lot of current through it. Maybe 75 amps? 100? It makes sense that removing that battery from the string made things go faster, because you effectively took a big battery charger/resistor out of the loop! __________________ Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata Honda mods: Ecomodding my $800 Honda Fit 5-speed beater Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage. Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget