Genuine Kyosho replacement part (part number W5303GMB)

and a compact battery configuration

Genuine HPI Racing replacement part #111347

The XT60 version is listed with an included adapter

Associated 29262 ESS-One+ 2017 Engine Sound System Hellfire Parts Genuine Kyosho replacement part (partAssociated 29262 ESS One+ 2017 Engine Sound System The ESS One+ is lighter and more compact in size, making it easier to install. The speakers have more power and longer life. The D Class amplifier chip ensures efficient performance and high quality sound output. Features: Uses advanced DNS DCR algorithm to reproduce the sound of real engines Supports two sets of quick switching engine sounds Supports AUX channel that can simulate a variety of sounds