Dell D5318 battery rebuild instruction

Laptop battery from some manufacturers have notoriously short lifespans, and the Ni-MH (Nickel Metal Hydride Battery) which replaced NiCd (Nickel Cadmium) in most applications just aren't that much better. So, you can think about crack open the stone dead Dell D5318 Battery back and see if it could be rebuilt. The first thing you'll notice is that Dell laptop battery packs aren't built to be rebuilt, they GLUE the things closed. Took some serious prying to get the thing Dell D5318 battery pack open, but definitely in reusable condition.
There isn't a whole lot to a Dell laptop battery, just a hard plastic shell, enough individual cells to make up the required voltage, and a thermocouple. The black wire scotch-taped between two laptop battery cells is the thermocouple, and it's positioned to measure the air temperature in the Dell D5318 battery pack, not the actual laptop battery surface temperature. Maybe that's why the batteries fail so fast. The only other component in the Dell D5318 battery pack is the little circuit board (below), which has nothing on it but the contacts for the notebook DC circuitry. When you buy a replacement >Dell Laptop Battery, you're just getting a new set of cells to run down.
The individual cells that make up the Dell laptop battery are simply strapped together with little contact strips which are soldered in place. To repair a Dell D5318 battery, you need to replace all the cells and resolder. To cost effectively repair a laptop battery, you'd either need to find the replacement cells wholesale, or be doing it for a laptop whose battery is just ridiculously overpriced to start with. For more laptop accessories information, you can find it here: Dell Latitude D620 Battery(4400mAh)
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