This is a Traxxas 5000Mah 14.8V 4-Cell 25C Lipo Battery, a Certified iD-Equipped LiPo battery that is engineered to provide the punch and on-demand power for achieving the top speeds that Traxxas models designed to reach. Traxxas Power Cell iD-Equipped LiPo batteries are engineered specifically to fit Traxxas models and maximize their full performance potential. Only Traxxas gives you more of what you want most: simple installation, a great price, and the most speed and run time available. Specifications: Type: LiPo Total Capacity: 5000mAh Voltage: 14.8V C Rating: 25 Length: 155mm Height: 34mm Width: 45mm Weight: 16.8g CHARGING NOTE: This battery can only be safely charged with a Traxxas iD Battery Charger. NEVER, UNDER ANY CIRCUMSTANCES, charge this battery using a non Traxxas iD Battery Charger. IMPORTANT LITHIUM POLYMER SAFETY INFORMATION DO NOT leave a battery in your model when charging DO NOT leave lithium batteries unattended when charging ALWAYS balance charge lithium battery ALWAYS use a LiPo Safe charging bag/box YOU MUST use a Li-Poly specific charger to charge lithium batteries (NiMH or NiCD only chargers WILL NOT WORK!) DO NOT over discharge lithium battery packs DO NOT expose batteries to sunshine or store/charge batteries at temperatures above 35C/95F or in a closed automobile. READ & UNDERSTAND the instructions carefully before operating this battery