Specifications: Voltage: 12V Capacity: 3500mAh Battery Type: Lithium-Ion Replacement Part: Dremel B812-03, B812-02, B812-01 Compatible Models: Dremel 8200 and 8220 rotary tools. Dremel 8300 oscillating tool. Announcements: Please don't store the batteries for a long time, it need to be used at least once a month. If it's necessary, please using a cotton swab with alcohol to clean the battery and the charger metal contacts. After long-time using in your power tools, please fully rest the batteries. Before recharging the batteries, please make sure that the batteries have already coolled down.
eBay