MacBook battery underclocks when no battery present

I discovered before I sent my MacBook in for repair the other day that when the battery isn’t plugged in, the CPU automatically clocks down to 1GHz. So for the past week I had it, it’s been operating at half speed. I wondered why it was so slow.

It’s still out for repair at the moment, and it definitely won’t be back before I go home tomorrow. Bummer. Lets see if I can get the repairpeople to send it back to me.