USB Charging. No Dedicated Charger Needed.Forget carrying a separate LiPo charger for your goggle battery. The Eachine battery case features an integrated USB charger—connect any standard 5V/2A USB power source. The LED indicator glows RED while charging and switches to BLUE when fully charged. Charge at home. Charge in the car. Charge from a power bank in the field. One less charger to pack. One less thing to forget.Power Check at the Press of a Button.Press the power-checking button. The LED indicators show remaining battery level instantly. Know whether you have enough juice for one more pack or need to swap cells before the next flight. No multimeter. No guesswork. No goggles-powered-on-just-to-check-voltage.Reverse Polarity Protection. Peace of Mind.Inserting 18650 cells backward is a common mistake—and in unprotected battery cases, it fries your goggles. The Eachine case features hardware reverse polarity protection. If cells are inserted incorrectly, neither the battery case nor your goggles will be damaged. Correct the orientation. Power on. Fly. This protection covers you against one of the most expensive mistakes in FPV.Low Voltage Auto-Shutdown. Battery Protection Built In.When the input voltage to your goggles drops below 6.8V, the system beeps and automatically shuts down. This prevents over-discharge damage to your 18650 cells, extending their lifespan and protecting your investment in quality batteries.Universal DC 5.5×2.1mm Connector. Fits Everything.The standard DC 5.5×2.1mm barre1 plug is the most common power input on FPV goggles. Compatible with:- Eachine: EV100, EV200D, EV300D, EV300O- Fatshark: Most models with DC barre1 input- Skyzone: Most models with DC barre1 input- DJI: FPV Goggles with DC barre1 inputAny other FPV goggle using a 5.5×2.1mm DC power portFits Standard 18650 Cells. No Battery Included.Compatible with 65-67mm ICR 18650 Li-ion cells (flat-top or button-top within this length range). Install two cells following the clearly labeled polarity markings. Batteries NOT included—use your preferred brand of 18650 cells. 84×48×23mm form factor fits goggle straps, pockets, and kit bags.Key Features* INTEGRATED USB CHARGER: Charge via any 5V/2A USB port. RED = Charging. BLUE = Fully Charged. No dedicated LiPo charger required.* POWER LEVEL INDICATOR: Press button to check remaining battery level via LED indicators. Know your charge status instantly.* REVERSE POLARITY PROTECTION: Hardware protection prevents damage to battery case and goggles if cells are inserted incorrectly. Correct and fly.* LOW VOLTAGE AUTO-SHUTDOWN: Automatically shuts down when voltage drops below 6.8V. Prevents over-discharge and extends 18650 cell lifespan.* DC 5.5×2.1MM UNIVERSAL CONNECTOR: Compatible with Eachine EV100/EV200D/EV300D/EV300O, Fatshark, Skyzone, DJI, and most FPV goggles using standard DC barre1 plug.* FITS STANDARD 18650 CELLS (65-67MM): Uses two ICR 18650 Li-ion cells. Clearly marked polarity. Batteries NOT included.* 84×48×23MM COMPACT: Fits goggle straps, pockets, and field kit bags.

Specification:

Important Usage Notes
* Use only 5V/2A USB charger. Do NOT charge via PC USB port—insufficient current may damage the battery.
* Batteries NOT included. Requires two 65-67mm ICR 18650 Li-ion cells. Install following polarity markings on the case.
* Do not store batteries in the case long-term. Remove cells if the battery case will not be used for an extended period.
* If goggles do not power on: (1) Battery voltage may be too low—replace with fully charged cells. (2) Batteries may be inserted in wrong direction—reinstall according to polarity labels.

Compatibility Checklist
– Eachine EV100
– Eachine EV200D
– Eachine EV300D
– Eachine EV300O
– Fatshark Goggles (DC 5.5×2.1mm input)
– Skyzone Goggles (DC 5.5×2.1mm input)
– DJI FPV Goggles (DC 5.5×2.1mm input)
– Other FPV goggles with standard 5.5×2.1mm DC barre1 plug

Package included:

1 × Eachine 7.4V 18650 Li-ion Cell Battery Case with Integrated USB Charger (Batteries NOT Included)