How to change the RTC / NVRAM / CMOS battery

Are you having to change the date and time on the computer often? Receiving error messages during Power On Self Test? Problems with Subscription services? The problem may be the battery in the computer. The battery only last up to 5 years starting from the day the motherboard was built. That means the motherboard may have been built at least a year before it was installed in your computer or longer by the time you bought the new computer. Here is a simple way to replace that battery.
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It’s actually Whizzy’s first computer. It has been a good computer. We mainly use it in the shop as the guinea pig. lol! This computer had Windows ME ,then after several modification, he installed XP. It still uses SDR SDRAM memory which isn’t designed for XP. Nowadays it’s used to research parts.
MrFixit
:O OMG you have a Compaq Presario! I had that computer a couple months ago but i had to replace it since it was very old it had windows ME on it but i still have it for like a backup computer