More than two terminals on cell phone battery

  • #1
332
1
Most batteries have only two terminals with symbols ''+'' and ''-''. I uderstand the function of two terminals. But almost all the cell phone batteries I have seen have more than two terminals. What is the reason for having more than two terminals? Please check this link:
http://www.batteries.com/images/256x256/17753.jpg [Broken]

Best wishes,
Jackson
 
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Answers and Replies

  • #2
mgb_phys
Science Advisor
Homework Helper
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Usually a temperature sensor ( check if one terminal is marked 'T' )
one way of charging these batteries is to just supply current and monitor the internal temperature rise - then back off the current to keep it in control.
 
  • #3
tony873004
Science Advisor
Gold Member
1,751
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My cordless phone has 3 terminals. The two outer terminals are common to each other. This way I can place the hanset on the cradle either face-up or face down.

Your 4 terminals might be so it can accept different chargers/phones. Or perhaps a discharge pair and a charge pair. I'm only guessing.
 
  • #4
Stingray
Science Advisor
671
1
Some batteries also allow connections to each individual cell (or some subset of them) to allow for more careful monitoring and charging. I don't know if this is common for cell phone batteries, though.
 

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