What's Inside a Laptop Battery Pack?

Have you ever what secrets lie in a laptop battery pack? Well I asked myself that exact question. What is inside my laptop battery pack? Well this is it (see photo above and video below). The pack is just a bunch of AA cells in a tight configuration, soldered together and packed in with some circuitry. Yep, just inexpensive AA's in a plastic casing. Why am I interested in this? My laptop battery pack used to hold about 7 to 8 hours of charge for my laptop (unbelieveable? believe it - its for the legendary IBM Thinkpad X40). Now, after 4-5 years it can only hold about 1.5 hours. So its time to find a replacement (or I can open it up and replace the internal rechargeable AA's myself if I'm brave enough). But I think i'll pass - I don't want to risk putting in a battery backwards or risking explosion while soldiering lithium batteries together. Perhaps buying a generic brand replacement would be cheaper than buying the genuine battery part.

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Submitted by Anonymous Stranger (not verified) on Mon, 11/01/2010 - 7:26pm.

They are not inexpensive AA's in a plastic casing. They are 18650 Li-ion rechargeable. In the picture these appear to be rather old 2.2Ah versions. you can buy these in pairs for around $5 and there is nothing to stop you replacing each one.

You need to test the voltage of each cell when the pack is fully charged. any cell showing significantly less than 4.2 volts is probably worth changing.

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