Gens ACE 7.4V Li-Pol Battery for PolarStar and GATE Pulsar HPA Engines

Gens ACE is a trusted battery manufacturer widely recognized in airsoft, RC, and FPV communities. This 7.4V Li-Pol battery is designed to power HPA systems with a JST connector, including PolarStar HPA Engines, GATE Pulsar Series, and complete HPA rifles such as the EPeS Admiral or Delta Armory HPA models. Compared to older NiMH batteries, it offers higher efficiency and more consistent output, while remaining smaller than typical Li-Ion batteries. This allows installation directly inside the rifle without the need for an external PEQ battery box or battery pouch. The result is a cleaner setup appreciated by every Mil-Sim player. The battery features a JST connector and a balance connector for safe charging and long service life.

Key Features

Technical Specifications

• Configuration: HPA Micro
• Type: Li-Pol
• Voltage: 7.4 V
• Capacity: 250 mAh
• Discharge Rate: 35C
• Dimensions: 37 × 21 × 11 mm
• Weight: 15 g
• Connector: JST
• Balance Connector: Yes
• G-Smart Connector: No
• Designed for: HPA rifles with JST-equipped HPA engines (PolarStar, GATE Pulsar, and others)

Charging, Maintenance & Storage

• Fully charge the battery at a low charging current before first use.
• Only use a charger designed for Li-Pol batteries.
• A Li-Pol safety charging bag is highly recommended.
• Never leave the battery fully discharged, as permanent damage may occur.
• For long-term storage, keep the charge level around 70–75%.
• Store in a dry place away from direct sunlight and high temperatures.
• A drop in FCU responsiveness may indicate the battery needs recharging.
• Read our detailed battery care guide here.

Package Contents

• Gens ACE 7.4V 250 mAh (35C) Li-Pol Battery

Frequently Asked Questions (FAQ)

Which HPA systems is this battery compatible with?

It is primarily designed for PolarStar, GATE Pulsar, Wolverine, and other HPA engines equipped with a JST connector. The 7.4V output is ideal for powering FCUs, where reliability and stable voltage are more important than high current.

Will it really fit inside the pistol grip?

Yes. Its compact dimensions of 37 × 21 × 11 mm are specifically designed for EPeS, Delta Armory, and similar HPA grips. It's one of the smallest practical Li-Pol batteries for HPA systems, eliminating the need for an external battery or PEQ box.

How long does it last on a single charge?

HPA systems consume very little power, so you can generally expect a full day of play. In practice, that means around 5,000–10,000+ shots, depending on your FCU and settings. Most players are more likely to forget to recharge it than run it empty.

Why is only 250 mAh enough when AEGs require much larger batteries?

An HPA engine doesn't power a motor or gearbox. The battery only supplies the FCU electronics and solenoid valve, resulting in dramatically lower power consumption than an AEG.

Can I use a higher voltage battery?

No. Always use a 7.4V battery, as higher voltage may damage the FCU. Unlike AEGs, HPA systems are not designed for 11.1V batteries. If you need more runtime, carry a spare battery instead.

What does the 35C rating mean on such a small battery?

A higher C-rating means the battery can handle rapid current spikes without voltage drop. While this isn't as critical for HPA as it is for AEGs, it helps ensure stable FCU operation.

How should I charge it properly?

Use a Li-Pol charger with balance charging support and a low charging current (ideally around 0.2–0.5 A). There's no need to rush—gentle charging significantly extends the lifespan of such a compact battery.