Two Pack 7.4V 700mAh Li Ion SM-4P Rechargeable Battery With Cable For HJ812 HJ820 HJ825 HJ822 HJ138 And Bezgar TX126 RC Boats Designed For Quick Swaps Reliable Power And Long Runtimes For Hobbyists
✔️ Two 7.4V 700mAh Li-ion SM-4P packs for HJ812/HJ820/HJ825/HJ822/HJ138
This two-pack 7.4V 700mAh Li-ion battery set uses SM-4P plugs, designed for quick swaps on specific RC boats. It’s a compact power source that helps hobbyists keep their HJ812, HJ820, HJ825, HJ822, HJ138, and Bezgar TX126 boats running longer between charges.
✅ Real capacity: 700mAh at 7.4V Li-ion (actual may vary 700-800mAh).
✅ Compatible only with HJ812, HJ820, HJ825, HJ822, HJ138 and TX126 RC boats.
✅ SM-4P plug; red wire is positive, black negative; ensure polarity matches your device.
✅ Dimensions: 54 x 28.5 x 14.6 mm (2.14 x 1.12 x 0.57 in).
✅ Weight: 45 g per battery.
✅ Discharge 10C, charge 1C.
✅ USB charging cable included; red LED shows charging, green when full.
✅ Package includes 2 batteries and 2 USB charge cables.
✅ Note: not for RC cars; verify correct polarity before use.
💡 What is a 7.4V RC boat battery used for and how do you pick the right one? Here’s a handy guide for hobbyists chasing longer runtimes.
- Compatibility: choose a 7.4V pack with the correct plug (SM-4P) to fit your hull
- Capacity matters: target 700mAh+ with 10C discharge for steady power
- Safety: ensure polarity matches and use the included USB charger
- Application fit: designed for specific boats like HJ812, HJ820, HJ825, HJ822, HJ138 and TX126