Noo fangled LiPo and old skool lectrix

[Miggers]

Right knowledgeable peepoles,

The time has come to go with the newer magic.

Looking at a 4000mah 7.4v 2S Zippy hardcased Lipo to go in my
Mardave Cobra-ish

My question is(I'm running brushed),can I bung one straight in with my
old brushed ESC(Mtroniks HF 250 fwd/brake)?
It's limit is (IIRC)15 turn motors.

I've seen old posts on here where peeps have run Lipo power in their old
RC10's,etc with their old skool brushed gear with great pleasure in blabbing
on how they've kept up with newer brushless machinery.

I'm going to order the above Lipo,a charger with storage voltage function,
LiPo charge bag and low voltage alarm,but I don't want to fry my classic
old speedo or have to shell out for a newer brushed speedo that won't handle my motors.

Ta.