[quote name='daroga']But one of those little disc cells isn't nearly enough power to maintain the Wii in a standby mode. Heck, those little batteries can't even keep my Dreamcast on the right day for more than a few months. That being said, this could likely be an easy-access port to change the clock battery. It just has nothing to do with WiiConnect24.[/QUOTE]
I think I made it clear it wouldn't be for standby mode. Just for the clock/calendar, which in a PC can be maintained for years by such a battery. Sega tended to have very bad implementations of their SRAM, which is why I soon learned that a Saturn save game had to be on a flash cart if you really wanted it to be there when you came back to the game.
Keep in mind that there are multiple power levels for standby. PCs have long had a 'Wake on LAN' feture that allows a PC to use just enough power to receive an Ethernet frame that causes a bootup. This bootup state doesn't require the PC to be fully active. Just enough for IT personnel to remotely do whatever they need to do. A casual observer would believe the PC to be entirely turned off until the hard drive and fan noise kicked in. This is more than a little valuable when a corporate campus is measured in square miles or might be hundreds of miles away.
The WOL can be found on most motherboards in the form of a three-pin connector adjacent to one of the PCI slots.
Similarly, a Wii in deep standby can maintain its clock and just enough awareness to bring the system up to a more active state if a remote network signal is received. Having more than one standby state can keep the power draw down considerably and win Nintendo good PR in regard to a growing issue. This remote access state of the Wii would still use much less power since portions of the chipset would be unused and could remain in standby while the rest became active.
Don't forget that this isn't necessarily an expendable battery. It could be a rechargeable intended to maintain the system at its most minimal state for days to weeks at a time. A Wii that goes longer than that with no external power source will need its clock rest on the next use but that isn't unusual in consoles.