In our 510 thread battery tutorial, Dan goes through different types of 510 thread connectors such as type ‘C’ and eGo. Battery capacity is measured in milliamp-hours and they range in size from 250mAh to 850 mAh in most cases. Some batteries have a feature known as “variable voltage” which allows you to regulate the… Continue reading 510 Thread Battery Tutorial. Comparison of vape pen style 510 cart batteries all types & features.