Protected button top batteries are commonly used in flashlights, medical devices, portable electronics, security equipment, and other applications requiring stable power delivery and built-in circuit protection. The button top design also improves compatibility with devices that require raised positive terminals.
Protected Button Tops
UltraFire 18650 Button Top 3.7v 3000mAh Rechargeable Battery
$11.99 $5.95 $5.95 / item
EVE 18650 Button Top 3.6v 3500mAh (Universal and Rechargeable)
$7.49 $6.99 $6.99 / item
Popular 21700 Options
Take a look at what fits the job for most
Pre-Order Available 
21700 4000mAh Li-Ion Protected Battery - Universal Flat Top
$10.49 $10.49 /
Hohm Run XL 21700 4007mAh 30.3A Battery
$9.89 $9.89 / item
Certified Hohm Tech 18650 Batteries
Hohm Tech Life V4 18650 Battery 3.6v 3015mAh 22.1A
$9.95 $7.89 $7.89 / item
18650 Battery Flat Top 2547mAh 25.3A Battery Hohm Work
$6.79 $5.49 $5.49 / item
Hohm Alone 18650 Battery 3.7v 3309mAh 15.3A ICR
$12.49 $8.99 $8.99 / item
Hohm Tech Mega 3.6v 18650 Rechargeable Battery – 2505mAh, 22A High Drain Li-ion Flat Top
$12.99 $7.79 $7.79 / item
