if it is a brushless ESC, you could look at the KD36-60-11L and run it on a 4s pack.<div>
</div><div>Truly, we need more information.  Can the ESC even handle 4s?</div><div>
</div><div>The more info the better, hull type size, any motor or prop combo, both voltage and amp rating for esc (brushed or brushless).</div>