The Giant Power packs are about the best packs for FE boats.
2 -2S -6000mAh packs in series will give you a 4S - 6000mAh
A Cat and a Sport Hydro will use a lot less Amps then say a Mono.
A Spec Sport Hydro race takes less then 2 minutes.
30 sec. for a slow mill lap then 90 sec. MAX of racing.
So 6000 mAh should be lots unless you have a very poor setup.
As MIC stated above, you may need 2 - 4S packs for balance, or weight.
Give your setup a try first before going to the 2 -4S packs.
I myself used 2 - 5000 2S packs in series for years. in my P Spec Sport Hydro.
Larry
Past NAMBA- P Mono -1 Mile Race Record holder
Past NAMBA- P Sport -1 Mile Race Record holder
Bump & Grind Racing Props -We Like Em Smooth & Wet
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