These are absolutely perfect for my t34!! Currently my full option t34 (Tamiya Pershing Innards), is powered by two subC-cell battery packs, 1200 mah each, giving me a run time of 40minutes. These will triple or more my run time. Sub-C battery packs, which were first used on the micro RS4 electric cars, are perfect for the WSN and Bandai projects or even the Tamiya Pershing, which is super tight if built by the book. Thanks for the info!!