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This is the Thunder Power "Pro Race"  3.7V, 40C, 5000mAh, Lithium Polymer Battery.

When you’re searching for Lithium Polymer batteries that feature the lowest internal resistance, the ability to deliver the most power available and offer the longest cycle life in the surface battery market, now you can stop, because you've found what you're searching for. Thunder Power Pro Race 40C series batteries have brought all of those desirable features to the surface battery market, in a ROAR legal Hard Case Shell! Their incredibly low resistance cells, capable of 40C continuous discharge rates, direct-to-cell-soldered 10 or 12 gauge wire leads and factory-installed Deans Ultra Plug connector offer the minimum resistance possible for maximum power and performance in even the most demanding racing applications.

NOTE: 1S LiPo requires the use of a Voltage Booster to ensure that the servo's and receiver receive a full 6V/3A throughout the duration of a run, allowing the electronic components to operate at their optimum levels.

Features:

• Assembled in USA using IR, capacity and voltage matched cells for maximum performance and cycle life
• The most-powerful and longest-lasting series of LiPo batteries released to date for surface vehicle applications
• Low-resistance, direct-to-cell-soldered 12-gauge main power leads with factory-installed Deans Ultra Plug connector
• Impact-resistant, hard-case housing with carbon fiber finish for added protection and improved durability throughout a variety of driving conditions
• Innovative housing and wire lead routing design allows wire leads to be positioned flush with the top or end of battery for easy installation in nearly every vehicle