Acer Aspire One D257 Battery Replacement

Put the netbook, so the back side is upwards.

Push the right lock to the right so the red filed is visible on the left.

Now move the left lock which is spring loaded to the leftand keep it there. Then with the other hand remove the battery by pulling down.

When reassembeling the new battery push it up into the netbook and do lock the right by moving it to the left so the red field disappears.