First, you should know what’s the voltage rating on your internal laptop battery pack? What’s the rating on your power brick? Laptop battery are complicated pieces of equipment. They are somewhat redundant as well. There’s a ’smart circuit’ in the hp laptop battery pack that monitors the conditions of the hp dv9000 laptop battery cells, however, it does not do what a lot of people say it does.

Parts: Soldering gun Solder (but of course) SAND (A MUST) BIG METAL CAN WITH LID (A MUST) fire extinguisher (somewhat a must depending on how careful you are) wires alligator clips Laptop dead battery undead battery. Safety preparations -put sand in can -place fire extinguisher someplace close Battery preparations -if you’re just replacing your dead hp dv9000 laptop battery cells with new ones, obtain the same number of cells.

I’ve seen some people who’ve posted how-to’s for replacing laptop cells immediately replace the cells seal the hp dv9000 battery and use it. This is extremely dangerous, unless you want to cook your lap. The quality of the cells purchased is unknown, and needs to be tested.

If your hp laptop battery doesn’t explode/catch on fire, that means the circuit is good/the cells are good. -Solder it permanently to the circuit, and fit it back into the plastic housing if it’s the same number of hp dv9000 laptop battery cells, if not be creative and line the cells up so it fits nicely.