More than two terminals on cell phone battery

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SUMMARY

Cell phone batteries typically feature more than two terminals for various functional purposes, including temperature monitoring and compatibility with different charging systems. A common configuration includes a temperature sensor terminal, which helps regulate charging by monitoring internal temperature. Additionally, some batteries have multiple terminals to allow connections to individual cells for precise monitoring and charging. This design enhances battery performance and safety during operation.

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jackson6612
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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

Best wishes,
Jackson
 
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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.
 
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.
 
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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