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The LS-100TS has tax keys. I suspect (for I cannot have access to a manual, just the online brochure by Canon) that you have to switch left to right or up-down one of the tax keys then you enter the tax percentage. and toggle back into position.
Undo 3 screws on the back. The rest of the case clips together along the outside edges, wriggle and pull the two halves apart (gently). Battery is easily visible and accessible. LR44, replace with + upwards. When you have reassembled the case you might need to press the reset button (on the back, small black dot, use a pen or similar to push it) before the calculator functions again.
This is an old A70, but the way it's done is very similar as I don't think this has changed much over the years. It's a pin design that you have to push out with a stiff unbent paperclip. You push in on the side with the smaller hole. To access the pin you'll need to remove the front and back case covers. See the following:
You need to have numlock on - even on a laptop. It's not very helpful like that because you typically can't use half the keyboard. Anyway once NumLock is on select PC or CAL. In CAL mode just type your calculation, get the result and press SEND to deliver the result to the PC, wherever you are typing. If you press PC mode the screen changes on the LS-120 and keypresses are sent through directly as you type them with no calculating done (like a numeric keypad).