Batteries how to buy extra?

Search on Amazon,they are available.

Can it be used in saltwater?

Anything can be used in saltwater. It would just be very important to flush everything out with fresh water each time you are done using it to prevent corrosion. The boat does suck water through a system to keep the motor cool so you would want to keep that clean. The top of the boat comes off to access the battery and that cover has a pretty good rubber seal that should keep excess water out of the hull. Just clean it good each time.

Model Number	HJ812
Number of Game Players	複数のプレーヤー。
Batteries Required?	Yes
Batteries Included	Yes
Material Type(s)	アクリロニトリルブタジエンスチレン (ABS)
Target Gender	Unisex
Manufacturer recommended age	8 years and up
Item model number	HJ812
Product Dimensions	30 x 8 x 6.4 cm; 608 g
ASIN	B0BM3X1N1Q

DEERC 高速RCボート LEDライト付き 自立式リモートコントロールボート プールや湖用 20MPH 2.4GHz レーシングボート リモコンシャーク 子供用&大人用 プールおもちゃ

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DEERC 高速RCボート LEDライト付き自立式リモートコントロールボートプールや湖用 20MPH 2.4GHz レーシングボートリモコンシャーク子供用&大人用プールおもちゃ