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Dual Batteries

Discussion in 'Chevy Trucks' started by Charles, Mar 22, 2006.

  1. Charles

    Charles Moderator Staff Member
    Messages: 253

    Do any of you change both batteries when one battery goes bad? Lets say the old one is around 4 years old. What is the harm in not changing both?
     
  2. Robhollar

    Robhollar Senior Member
    Messages: 766

    Always change them in pairs. If you dont then you will ruin the new battery....Rob
     
  3. Charles

    Charles Moderator Staff Member
    Messages: 253

    Ok, thats what the guy at the shop said. Just wanted to check and see if he wasn't trying to just sell me something else--thanks!
     
  4. ITs true.....and make sure that they MATCH!!! (in amps)
     
  5. troy28282

    troy28282 Senior Member
    Messages: 178

    If you dont change out both, I've heard that you could explode a battery because the charging cycles are the same. Thats what I've heard at least, if theres any truth to it I dont know.
     
  6. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,992

    Yes change them both
    Do a search on dual batteries, there have been some good threads, with some excellent information on just this topic.
     
  7. Charles

    Charles Moderator Staff Member
    Messages: 253

    I only ran the new one with the old one for 15 minutes after buying it. I took the old one out this morning and replaced it with the exact same battery. They said the old one was "Unstable" too anyway
     
  8. Brookside

    Brookside Member
    Messages: 55

    Couldn't resist throwing this in to stir the pot. Our '98 Chevy K3500 7.4L came with two batteries, and at four years the primary battery pooped out. I replaced it, and at 8 years the secondary battery still has the green eye and all systems are go.
     
  9. SnowMatt13

    SnowMatt13 PlowSite.com Addict
    Messages: 1,533

    Green eye only means the cell that it is attached to is good, the rest of the cells in the battery could be bad.
     
  10. Charles

    Charles Moderator Staff Member
    Messages: 253

    Yea, mine still had the green eye and it tested as "unstable"
     
  11. SnowMatt13

    SnowMatt13 PlowSite.com Addict
    Messages: 1,533

    Same thing happened to me. I tested my batteries and one tested bad. The green eye was still showing, thought I was losing my mind. Took it to the the local Chevy stealer and it was bad.