Easy way to change Casio Edifice EFA-121 battery without remove the chain strap

Amateur DIY. Been do this batteries change for Casio Edifice EFA-121 for several times as I already own that for about ten years (If my memory serve me good). The battery lasted about 3-4 years. But everytime I need to change, I struggle with battery type to buy (Renata 395 SR927SW silver 1.55v), and find the info for resetting terminals. So I made this video for personal documentation and easier to find again when needed, but may be it help somebody else. Tried to setup the video but I can't adjust the fokus. Sorry about the quality