Amazon.com: HQRP 3-Pack Lithium Battery Compatible with CASIO G-Shock : Health & Household
Literally had to replace the battery on this thing every year I've owned it, so I think it's faulty since I barely wear it and use the Bluetooth or flash anyways. What's
How to Change a CTL1616 Rechargeable Watch Cell in a Casio G-Shock - Esslinger Watchmaker Supplies Blog