View Single Post
Old 07-25-2011, 11:05 AM   #10 (permalink)
MetroMPG
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,058

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 54.01 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)
Thanks: 2,843
Thanked 5,705 Times in 2,949 Posts
It's ~130 bucks to replace the entire pack assembly, the store says.

I've already disassembled the pack, and will probably just swap out the single dead battery with a new one ***. Here's what it looks like:








The spade connectors on the wiring were soldered to the battery tabs.

*** I realize adding a new battery with full capacity to the older one creates an unbalanced pack, which could lead to the quick demise of the remaining original battery. (As the pack is discharged, the old battery will drain faster.)

The workaround is to monitor the battery voltage of the older battery, and ensure it's not drawn below the magic number of 10.5 volts under load. Below that voltage (1.75v per cell), a lead acid battery can be quickly, irreversably damaged.
Attached Thumbnails
Click image for larger version

Name:	24v-pack-closed.jpg
Views:	215
Size:	63.2 KB
ID:	9067   Click image for larger version

Name:	24v-pack-open.jpg
Views:	219
Size:	76.4 KB
ID:	9068   Click image for larger version

Name:	12v-12Ah-20hr.jpg
Views:	227
Size:	34.7 KB
ID:	9069  
__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



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
  Reply With Quote