Oper8 7.4v 300mAh HPA LiPo Battery - Compact FCU Power

The Oper8 7.4v 300mAh LiPo is the gold standard for powering HPA Fire Control Units (FCUs). When running an HPA system - space inside the pistol grip or stock tube is at an absolute premium. This ultra-compact battery is designed to provide reliable - consistent power to your PolarStar - Wolverine - or Jack engine without the bulk of a standard LiPo. With a high-quality JST connector and a stable 7.4v output - it ensures your electronics stay awake through the longest skirmish days while remaining small enough to be tucked away in even the tightest custom builds.

Key Features and Performance

• Ultra-Compact Profile - Small enough to fit inside most HPA-converted gas blowback grips or slimline stock tubes.
• JST Connector - Plug-and-play compatibility with almost all major HPA FCUs on the market.
• 7.4v LiPo Technology - Provides a snappy response and consistent voltage for solenoid activation.
• 300mAh Capacity - Specially balanced to provide enough power for thousands of shots while maintaining a tiny footprint.
• High-Flex Wiring - Built with durable - flexible silicone wire to prevent snapping or fatigue during installation.

The "Pro" Take

The biggest mistake I see HPA players make is trying to cram a standard 1000mAh buffer tube battery into an HPA build. You end up pinching wires or - even worse - damaging your FCU. The Oper8 300mAh unit is exactly what you need. Because HPA engines only use a tiny pulse of electricity to move the solenoid - you do not need a massive capacity. This battery will easily last a full day at a weekend event - and its size means you can actually close your grip cover or stock plate properly. It is the neatest way to power your rig - period.

UK Spec and Site Performance

For the UK airsoft player - reliability in varying temperatures is vital. Whether you are playing in the damp - cold winter of a Scottish woodland site or a humid indoor CQB arena in London - this LiPo maintains its discharge rate effectively. Unlike some smaller cells that struggle when the temperature drops - the Oper8 cells are robust enough to keep your engine cycling perfectly at 30 rounds per second.

In terms of UK regulations - this is a 7.4v battery and is entirely legal to own and use without a UKARA membership. It is compatible with all UK-spec HPA engines. We always recommend charging this with a dedicated LiPo balance charger to ensure longevity - especially given the specific damp conditions we often face at British sites which can be hard on electronics if they are not stored correctly.

Friendly FAQ

How many shots will this battery last?
Because HPA FCUs use very little power - this 300mAh battery can typically power between 15,000 and 20,000 shots - which is more than enough for a full day of heavy trigger use.

Will this fit inside a standard M4 pistol grip?
Yes - this is specifically designed to sit alongside your HPA line inside a standard grip - leaving plenty of room so you do not crush the wiring.

Can I charge this with a standard LiPo charger?
Yes - as long as your charger has a JST adapter or you use the balance lead - it charges just like any other 2-cell (7.4v) LiPo battery.

Is it compatible with PolarStar and Wolverine?
Absolutely - it uses the standard JST plug that is found on the vast majority of HPA engines sold in the UK.