HFeldmann As Jeane wrote: no, it isn‘t. Neither the ESC, nor the motor or any other components are really waterproof in terms of long term function after drowning the car or driving through deep water. In addition, you should consider greasing the complete RC car. The diffs and bearings, every metal joint is completely bone dry. After two hike tours with a total length oh about 20 km, the first bearings were blocked by rust. So I decided to completely disassemble the car in order to remove the rust and added grease to all diffs, gears and bearings. Now it runs smoothly like a cat. ;) I strongly recommend doing this (disassembly, applying grease to all moving parts, reassembly) to everyone who buys this car. If this is done (and repeated once in a while) you will have fun with the Rock Hammer for much longer.

HFeldmann Hello, As Templia already wrote, there is a NiMH battery with 2000 mAh with Tamiya connector. The travel time with the battery is about 20 minutes. That was too short for me personally because I take the crawler with me on hikes. Accordingly, I swapped the plug on the ESC for a Dean plug (re-soldered) and bought two 6000 mAh LiPo 2s batteries. With one of these two 6000 mAh LiPo batteries, the car runs for almost 2 hours at walking pace (approx. 5 kmh). In comparison, the runtime with the included NiMH battery looks really poor: 2000 mAh NiMH: approx. 20 minutes 6000 mAh LiPo 2s: approx. 115 minutes. I have not yet done a test of the real capacity of the NiMH, but it probably won't reach 2000 mAh. The ESC can easily be switched from NiMH to LiPo with a jumper; of course you need a LiPo charger. So if you want to increase the energy density of your battery, you should consider buying LiPos instead.