7.4V 1500mAh Li-ion RC Boat Battery (4-Pack) - High Power

In this review the focus is on a practical replacement power pack for Huanqi and UDI model RC boats: a 4-pack of 7.4V 1500mAh lithium-ion batteries with SM-4P plug and USB charger cables. The bottom line is simple: hobbyists who run high-speed RC boats and need multiple ready-to-go packs will appreciate the consistent high power output and the convenience of bundled USB charging. The set is aimed at users who value compact batteries that match factory dimensions and offer a steady 15C discharge for bursts of speed without bulky adapters.

Key Features

• 7.4V 1500mAh capacity: Provides a balance of runtime and weight suitable for small to medium sized high-speed RC boats.
• 15C discharge rate: Delivers reliable power for acceleration and sustained high-speed operation in hobby boat use.
• SM-4P plug included: The standard black 4-pin connector ensures a secure, stable connection to compatible Huanqi and UDI models.
• Compact fit: The precise dimensions and 95 g weight make these packs easy to fit into tight hull compartments without major modification.
• USB charging included: Two USB cables are supplied for straightforward charging from common USB power sources when a dedicated charger is not available.
• Compatible models listed: Sold as direct replacements for Huanqi 961, 962 and UDI902, UDI002 boats, reducing fitment guesswork.

Who It's For

This 4-pack is aimed at RC boat enthusiasts who run regular sessions and need multiple batteries to extend time on water without long waits for recharge; racers who want a modest power boost for short sprint runs will also find the 15C discharge useful. The compact size and stock connector make it suitable for owners of the specified Huanqi and UDI models who prefer drop-in replacements rather than custom wiring.

Users who require very long runtimes, extremely high discharge (more than 15C) for heavy-modified boats, or integrated battery management features should look at higher-capacity or higher-C-rated packs and dedicated chargers instead.

Pros & Cons

Pros

• Consistent battery quality reported by customers, indicating reliable construction for hobby use.
• Four batteries in the pack reduce downtime and make multi-session use convenient.
• Included USB charging cables simplify recharging from common power sources without extra accessories.
• Compact dimensions and standard SM-4P connector offer a tidy, secure fit in compatible hulls.

Cons

• Battery life receives mixed feedback, so long-term runtime and longevity may vary by use and charging habits.
• USB charging is convenient but slower than a dedicated balance charger and lacks advanced charge reporting.

Specifications

Voltage	7.4V
Capacity	1500mAh
Discharge Rate	15C
Connector	SM-4P 4-pin plug
Dimensions	69.6 mm x 37 mm x 18.7 mm
Weight	95 g
Included Accessories	2 USB charging cables

Our Verdict

The 4-pack of 7.4V 1500mAh Li-ion batteries is a practical value for hobbyists who run Huanqi 961, 962 or UDI902/UDI002 boats and need multiple spare packs for longer on-water time. With a solid 15C discharge and stock SM-4P connectors these packs offer reliable performance and easy installation, though users seeking the fastest charging or maximum longevity should pair them with a proper charger and careful charging habits.

Frequently Asked Questions

Are these batteries compatible with Huanqi 961 and 962?
Yes; the packs are specified as compatible with Huanqi 961 and 962 models and use the standard SM-4P connector for a direct fit.

Can I charge these with a USB phone charger?
Yes, two USB charging cables are included for convenient charging from USB power sources, but charging will be slower than using a dedicated charger.

How long will a single battery run in typical use?
Runtime varies by boat load and throttle use; customers report mixed runtime results, so expect moderate session lengths for high-speed runs and longer time at moderate throttle.