85w charger on a 13-inch MacBook Pro Early-2011 without a battery.

I have an 85watt mag-safe on my bench. I use it to power any Mac-book that comes in. It have an end adapter for the newer machines. Some MacBooks need a battery installed for little extra boot power but most 13" machines will boot just fine. The link XTerminal give says, "You can use a compatible higher wattage adapter without issue, but it won't make your computer charge faster or operate differently. Lower wattage adapters will not provide enough power." You date and time my be lost without the battery if left unplugged for a while.