This is my second battery. The first started to swell up after 2 years of storage and only 2 charge cycles in a computer that is a backup to another computer maintained to run special, very old software. This new battery had an issue that the mounting holes did not line up with the screw holes in my computer. Made putting in the right most screw nearly impossible. You will need to increase the hole size slightly by drilling it out to get the screw in. If you are going to store the computer for long times, leave a charge that is less than 50% and check the charge and computer every month without fail to maintain the battery. If a battery goes dead flat, it may not recover... I wonder if these batteries are freshly made or years old.