Unusable or just poorly made? Thought the LR44 on the left might have been broken or leaking acid, but upon closer inspection it might just be adhered crookedly? Is it safe to
Amazon.com: POWEROWL High Capacity CR2025 Battery (15-Pack) 2025 3v Lithium Batteries, 10 Years Leak-Free : Health & Household
Amazon.com: SR621SW Battery 364 621 for Watch Battery 1.5V Button Cell Pack of 10【3-Year Warranty】 : Health & Household
IK1ZYW Labs: Failing button cell batteries
Button Cell batteries as coins | BoardGameGeek
Remember that coin cell batteries leak from the negative side, which for most game cartridges is facing the PCB, so you might not even see the leakage unless you remove the battery :