Yes, the Axial UTB18 Capra 4WS RTR is designed to be waterproof. The electronics, including the Spektrum Firma 25A ESC, the SR515 5-channel receiver and the S664 25T servos, are protected against water and dust. This enables use in various weather conditions and on wet terrain.
Please note, however, that "waterproof" does not mean that the vehicle can be completely submerged. It is advisable to clean and dry the buggy after use in a damp environment to ensure the longevity of the components.
3S operation: The model is designed for 2S LiPo (7.4V). 3S operation (11.1V) is not recommended as this can lead to overheating or damage to the motor/controller[^1^].
Water contact: The official specifications do not include an IP protection class. There is a risk of electronic damage in the event of contact with water - dry environments are recommended.
[^1^]: Based on the supplied 7.4V components and typical manufacturer specifications for comparable RTR models.
*Note:* For precise information on voltage limits and watertightness, there is no specific manufacturer information in the data provided. If you are unsure, we recommend consulting the official Axial documentation or your dealer.
An 850mAh battery could fit in the Capra UTB18 4WS RTR buggy, as the model is equipped with a 650mAh battery as standard. However, compatibility depends on the dimensions and shape of the battery, which should match those of the original battery. It is advisable to check the exact dimensions of the battery to ensure that it fits into the intended battery slot.
The speed of the Axial UTB18 Capra 4WS is not explicitly stated as it is an RC crawler designed for manoeuvrability and off-road capability rather than high speed. RC crawlers are generally slower than other RC vehicles, as they are designed for overcoming obstacles and driving on rough terrain.