Ofcourse its due to each manufactuere can make in their own type. Anybody has idea of this specific battery? Normally in a 3 pin battery, 2 are common and in a 4 pin battery, 2 pairs are common. You will have to determine which pins are common by actually measuring the voltages/resistances between them.
Lots of new batteries (for mobile devices, MP3 players, etc) have connectors with 3 pins. I would like to know what is the purpose of this and how should I use these three pins? They are usually marked as (+) plus, (-) minus, and T. Where have you seen the third pin? Im interested in it. Roomba batteries too.
4-pin: 2 positive poles are on the Keys side, 2-pin: Negative pole is on the Keys side. 2. Connect positive (+ )port to red cable and negative (-) port to black cable. 3. Only 40-50% power when you receive the battery, recommended to turn on the power switch when Charging (use the keys).
The pinouts of phone batteries are different between all types. You can almost see these pinouts in many cases: All About Battery connector pinout of mobile phone and also maybe this link will help you: Why are there 3 pins on some batteries? I think this is the correct answer - no way to tell for sure.
If you want to explore what’s inside single-cell Li+ battery packs, look-up bq27000 gas gauge IC and associated application notes. Could be a good starting point. Some packs have 4 terminals: positive, negative, SDA, SCL. The latter 2 lines are I2C or SMBus. Look up the bq27200 gas gauge IC (shares datasheet with bq27000).
The third pin is usually found on Li-Poly, or Lithium Polymer batteries and is required in order to charge the battery safely. Because these batteries are usually multi-cell, the third pin is used for balancing the charge between each of the cells.
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