Tenergy AG10 LR1130 Button Cell Batteries 1.5V (10-Count), 389 390 Alkaline Battery Replacement for Watches, Calculators, Toys, and Small Electronics

Customers find these button cell batteries work well in calculators and rulers, and appreciate their perfect fit and size. They receive positive feedback for their quality and versatility, with one customer mentioning they're great for laser pointers and cat toys. The battery life receives mixed reviews - while some customers find them long-lasting, others report they don't last even a full day.