Are you talking about the lipo? Or the batt you get with the stock setup?
I have heard of people using the P-51 lipos in their strykers.
Correct me if I'm wrong but I think that the P-51 batt (stock one) is the same as the stock stryker batt. It might have 1 more cell but I recal them being the same.
Someone else better respond, too. All this info was gotten off of the internet, not from my exp.
