My wife's Dell 530s started demanding a boot disk the other day. We had to push a key to get it to boot. I did some routing around in BIOS, and it wouldn't hold a setting. Ah, I thought. Bad mb battery. I keep spares, so i took her machine downstairs and removed the CPU heatsink fan. I used a vacuum to suck the dust from the heatsink, then used a DataVac to blow out all the other dust. Replaced the CR2032. The old one registered flat zero on the battery tester. Wow -- we sucked it dry!
Back in action as my wife's main machine. I just now checked its system screen: 2.53GHz C2D E7200 with 4B RAM. I swapped out the 500GB HD for a 500GB Samsung 840 SSD. Even though its on SATA II, the thing flies.
I offered to build her something new, but she prefers her little speed demon -- especially since I replaced the battery. What did we get? Something like 7 years on that thing? Can't complain.