Hardware - Custom Battery Our automatic batteries combine superior device materials with essential features optimized for Kurvana oil. With details such as a gold-plated positive pin, soft-touch coating and multiple color options, Kurvana batteries go a step beyond the average by combining luxury with efficiency. Features: 350 mAH battery 510 Buttonless Design + Connection Quick Charge Optimized for Kurvana Cartridges but can be used on any 510 threaded cartridge