According to rule R73:
Quote:
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<R73> The 7.2V Robot Control backup battery must be connected to the Robot Controller as described in the Robot Controller manual. The 7.2v battery should be charged to at least 7.0v before entering a match. As a replacement for the FIRST supplied battery, any other commercially available 7.2V NiCad battery pack may be used.
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So you can use any 7.2V NiCad battery including the blue one available for purchase from IFI.