The Batteries are now exposed and the calculator is face down with the back towards you.

Remove the bottom batteries by pressing the battery towards you while pulling it out from the far end.

If you can not do the previous step with your finger try using a flat ended tool such as an Ipod opening tool.

After the bottom battery has been removed push or slide the other(top) battery towards you until it is fully exposed in the battery slot.

Now simply remove the battery.