KBT 2 Pack 21750 Button Top 4.2V Rechargeable 4000mAh Battery with Over Charge Protection

Upgrade your devices with the KBT 2-Pack 21750 Button Top Rechargeable Batteries, designed for longevity and safety. These high-capacity 4000mAh batteries come with built-in protection against over-charging, over-discharging, and short-circuiting, ensuring your devices operate smoothly and safely. Perfect for a wide range of applications, from flashlights to electronic gadgets, these batteries are a reliable power source you can trust.

• Voltage: 3.7V / 4.2V
• Capacity: 4000mAh
• Size: 21mm Diameter * 75mm Length
• Type: Rechargeable Lithium Battery
• Protection: Built-in protection board with over-charge, over-discharge, and short-circuit protection
• Life Cycle: Approximately 800 charge and discharge cycles
• Certification: UN38.3 test standards compliant

Ideal for everyday use, the KBT 21750 batteries are engineered for devices that demand high performance and durability. Whether you're powering high-drain devices or need a reliable backup, these batteries offer the perfect blend of capacity and safety. Remember to fully charge and discharge the battery once a month if not in regular use to maintain optimal performance. Certified for safety and quality, these batteries undergo rigorous testing to meet international standards, providing peace of mind with every use.