I am trying to replace a rechargeable lithium ion battery with one that has a longer lifespan when charged. The one I have has 8 wires, but every one I find has 2. It has 3 red, 3 black, 1 yellow, and 1 white.

3.7V 2200mAh rechargeable Lithium ion battery (8 wires)

As you can see: Rating: 3.7V 2200mAh

Can I replace it with something like this 6000mAh one, from SparkFun? https://www.sparkfun.com/products/8484

Thanks, guys!

  • \$\begingroup\$ Open it and figure it out \$\endgroup\$ – PlasmaHH May 30 '16 at 13:51
  • \$\begingroup\$ That's why I'm asking you guys. I don't have a replacement one. \$\endgroup\$ – HTDE May 30 '16 at 13:52
  • \$\begingroup\$ "The one I have has 8 wires" it seems you have the one you have to open, don't you? \$\endgroup\$ – PlasmaHH May 30 '16 at 13:55
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    \$\begingroup\$ The reds are positive, blacks are negative (it says so on the label). I'm guessing that the white and yellow ones are connected to a temperature sensor or other monitoring sensor. \$\endgroup\$ – Dampmaskin May 30 '16 at 13:58
  • \$\begingroup\$ Ok, that makes sense. What I don't get still is why there are 3 of each kind of terminal, instead of one. Can I convert them? \$\endgroup\$ – HTDE May 30 '16 at 14:01

From the color code of the wires it's obvious that you have 3x B- and 3x B+ on the sides. The schematic in the datasheet suggests that the two wires in the middle are P- and NTC, for temperature sensing.

enter image description here

I don't speak any Chinese, so you can only trust my statement that much.

Regarding replacement batteries, if your system has only two wires, it's more or less safe to take a battery with extra connections (like temperature sensors) and simply ignore them. However, if your system expects a battery with temperature sensing, connecting a battery with only two wires is not recommended, and may be impossible: many systems won't charge a battery if they don't get a reasonable signal on the sensing inputs.

  • \$\begingroup\$ Thanks! So, any reason why it needs 3 wires each instead of 1 of each? Can I make it compatible? \$\endgroup\$ – HTDE May 30 '16 at 13:59
  • \$\begingroup\$ You need 3 wires if you want to draw a lot of current. The bare minimum is 1 black and 1 red wire. \$\endgroup\$ – Dmitry Grigoryev May 30 '16 at 14:02
  • \$\begingroup\$ I'm sorry. How do I go about finding a battery like that? Or figuring out how to hook up more wires? \$\endgroup\$ – HTDE May 30 '16 at 14:05
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    \$\begingroup\$ Does my last edit answer your question? Finding a battery like that is as easy as googling for "li-ion battery with NTC" \$\endgroup\$ – Dmitry Grigoryev May 30 '16 at 14:17
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    \$\begingroup\$ I'm laughing at how part of the circuit diagram has been flipped with the English backwards. \$\endgroup\$ – Bradman175 May 31 '16 at 0:31

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