![Amazon.com: CPZZ 3.7volt 18650 Rechargeable Battery 3.7v Battery 18650 Rechargeable Battery Lithium 3.7 Volt Button top for flashlights and headlamps etc,2pack : Health & Household Amazon.com: CPZZ 3.7volt 18650 Rechargeable Battery 3.7v Battery 18650 Rechargeable Battery Lithium 3.7 Volt Button top for flashlights and headlamps etc,2pack : Health & Household](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/41vtH3bgZzL._AC_UF894,1000_QL80_.jpg)
Amazon.com: CPZZ 3.7volt 18650 Rechargeable Battery 3.7v Battery 18650 Rechargeable Battery Lithium 3.7 Volt Button top for flashlights and headlamps etc,2pack : Health & Household
![coping with 18650 batteries with and without button tops - Roger Frost: science, sensors and automation coping with 18650 batteries with and without button tops - Roger Frost: science, sensors and automation](https://www.rogerfrost.com/wp-content/uploads/2020/11/IMG_20201124_165533-1024x484.jpg)
coping with 18650 batteries with and without button tops - Roger Frost: science, sensors and automation
![Amazon.com: CBJJ 3.7 Volt Rechargeable 18650 Battery 9900mAh 18650 3.7V Battery Button Top Battery for Flashlight, Headlamp, 8 Pack : Health & Household Amazon.com: CBJJ 3.7 Volt Rechargeable 18650 Battery 9900mAh 18650 3.7V Battery Button Top Battery for Flashlight, Headlamp, 8 Pack : Health & Household](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/713cEJZjdTL._AC_UF894,1000_QL80_.jpg)
Amazon.com: CBJJ 3.7 Volt Rechargeable 18650 Battery 9900mAh 18650 3.7V Battery Button Top Battery for Flashlight, Headlamp, 8 Pack : Health & Household
![LG INR18650MJ1 18650 3500mAh 10A - Button Top Battery - Lithium polymer Li-polymer 3.7V Custom 18650 Lithium Ion battery pack, 18650 batteries, battery housing China manufacturer 10 years-Great Power LG INR18650MJ1 18650 3500mAh 10A - Button Top Battery - Lithium polymer Li-polymer 3.7V Custom 18650 Lithium Ion battery pack, 18650 batteries, battery housing China manufacturer 10 years-Great Power](https://greatpow.com/wp-content/uploads/2019/01/LG-MJ1-18650-3500mAh-10A-Button-Top-Battery.jpg)