[MJX HYPER GO H10G 1/10 4WD Off-road All Rock RC Crawler]
5000mAh is generous runtime for a 1/10 crawler, and on the MJX Hyper Go H10G RC Car 2S is the recommended match for the 3300KV motor. Don't go 3S.
Stock Configuration
A 2S 5000mAh LiPo is recommended. Note the version difference: the standard version ships without a battery or charger, while the DC version includes the 2S 5000mAh pack and charger. The battery shown in product images is marked 2S 6000mAh 35C 7.4V, which doesn't exactly match the recommended 5000mAh, so go by what's actually in the box.
Real-World Performance
Crawlers draw far less current than on-road cars or monster trucks, so 5000mAh typically covers an afternoon. 3300KV on 2S has enough power, and 3S won't make it a better crawler. It only makes low-speed control harder to modulate and adds load on the ESC and motor.
Maintenance and Upgrades
Don't run the pack until the truck stops moving, and for storage keep cells around 3.8V. The stock charger is basic, slow, but gentle on the battery.
FAQ
Q: Can I run 3S?
A: The documentation you provided doesn't mention 3S support. Sticking with 2S is the safest call.
Conclusion
Stock battery runtime and voltage matching are both sensible, and on the MJX Hyper Go H10G RC Car there's no need to upgrade to 3S.