this is direct from proboat about the widowmaker battery's
HI Todd,

Thank you for contacting Horizon Hobby Product Support.

The widow maker was not designed for Lipo batteries. There caption was
taken directly out of the manual:

Due to the high current demands of
a brushless powered boat, Pro Boat
recommends only the batteries listed
above or equivalent.



If you should need further assistance regarding this issue please reply
to this e-mail for additional support. If you need assistance in the
future, please feel free to e-mail us at productsupport@horizonhobby.com
or you may also contact us toll-free at 1-877-504-0233. Make sure to
visit our web site at http://www.horizonhobby.com to see all of our
newest products!


Thank You,


David W.
Horizon Hobby
Product Support Team
4105 Fieldstone Rd
Champaign IL 61822
1-877-504-0233