![]() The BR-2032 is a high-temperature model of the CR-2032 and is recommended for specific models of Macs that run a bit hotter.įortunately, OWC can tell you what type of battery you need, sell you the battery, and provide installation instructions. CR-2032 batteries are very common most stores that sell batteries have CR-2032s in stock. If your older Mac is displaying the error message, then it’s probably a good indication that the PRAM battery needs to be replaced. The following Macs have CR-2032 or BR-2032 backup batteries (see image at right) that may need to be replaced from time to time:Įarlier Power Macs, iMacs, eMacs, Mac Quadra, and Mac Centris models use an ER14250 3.6V PRAM battery. It might appear that the date and time on the computer are correct, but even a slight discrepancy on the order of a few seconds causes the error message to be displayed. If the Mac starts up and sees a discrepancy between the internal time and NTP time, you’ll see an error message. Older Macs used an internal battery (usually a CR-2032) to retain PRAM (parameter random access memory) settings and keep an internal clock running. The screenshot at the top of this post shows that Macs are set to check the time through an Apple NTP server (). When the Mac is set up, you supply it with your time zone (and it can also determine your location through Wi-Fi positioning), and it knows that the computer is currently at a certain offset from Coordinated Universal Time (UTC – the current time at the Prime Meridian in Greenwich, England). ![]() Macs always check the time when they connect to the internet, through what’s called an NTP (Network Time Protocol) server. The most likely culprit is a dead PRAM battery on the motherboard of an older Mac. Here’s what the problem is, along with a solution. ![]() The other day, an email arrived asking “I have an iMac running 10.13.6 and somehow when I start my Mac it tells me that my date and time is incorrect, but it’s not so I was wondering would you be able to explain to me in an easy way that I can understand: what’s going on?” Some of them come from readers who ask questions that intrigue me. System Preferences > Date & Time shows that this Mac checks the current time and date against an Apple NTP serverĪs a longtime tech writer, I’m sometimes asked how I get ideas for articles.
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