Walter Shillington My old lighting system consisted of a tripod fitted with two flexible metal arms, each terminating with a five-inch ring light. An Anker power bank supplied the required power. This setup provided me with a completely portable light source capable of running for several hours between charges. Last year, after I updated to a more powerful lighting system, the power bank was tasked with the less glamorous duty of recharging my smartphone during my infrequent business trips. When comparing backup power sources, the power bank is pretty much on the bottom of the scale. At the top, you find expensive gas-powered generators, some of which are fully capable of running your home during a power failure. The gap is filled by a relatively new device called the portable power station. Like the unobtrusive power bank, they rely on a series of lithium batteries. These devices, however, are much more powerful and provide an extensive and varied selection of inputs. Many of them are equipped with an inverter that provides an AC output. Today, I am taking a close look at the Joyzis BR300 Portable Power Station.


The Joyzis BR300 weighs in at seven pounds. It is rectangular with dimensions of 8.9 x 5.7 x 5.6 inches. This power station is composed of gray and black ABS resin and fitted with a green ABS handle. Vents for the interior fan are located on the right and left-hand sides of this unit. A reading light is located below the left vent, and a brighter light is situated on the right-hand side. The top of the BR300 is utilized as a wireless charging station. The front is fitted with both an AC and a cigarette-style DC outlet. Huddled between them are two USB-2 outputs, a USB-3 output, a PD 60W port, a DC input, and a DC output. This system includes an AC adapter that allows the unit to charge via its PD 60W port, an adapter that connects it to a car charger port, and a user’s guide.


Brand: Joyzis Name: Portable power station Model: BR300 Capacity: 80,000mAh 296Wh Shell material: ABS resin (flame resistant) Weight: 3.19 kilograms (7 pounds) Dimensions: 22.5 x 14.5 x 14.3 centimeters (8.9 x 5.7 x 5.6 inches) DC output: 12V/10A DC input: 18V/3.5A Type-C port: PD 60W USB output: (2) USB 5V3A (1) USB 5V3A 9V2A AC output: 300W/110V 60HZ sinewave Wireless charging: Max 10W (supports 7.5W, 5W) Illumination: Strong light/fast flash/SOS/reading light Battery type: Lithium Charging time: 10 – 12 hours

The Manufacturer

Joyzis is trademarked by the Shenzhen Benrong Technology Co.


This device is fitted with a bank of lithium batteries capable of supplying up to 300 watts of AC power at 110 volts. It is rated at 80,000mAh. The length of time that power is supplied depends directly upon the number of watts drawn by the devices connected to the power station. Since the Joyzis BR300 is rated at 296-watt hours, it will keep a 1W light lit for 296 hours. On the other hand, a projector that draws 74 watts will run for four hours. It also should be noted that, as a power station’s inverter converts DC to AC, a power loss of approximately 15 – 20 percent occurs. If used to power an AC device, this effect reduces the watt-hours available.


Those that suffer from sleep apnea often utilize a CPAP (continuous positive airway pressure therapy) device to assist their breathing while asleep. A portable power station would prove invaluable to them during a power failure or while camping. Walter Shillington Walter Shillington


This power station can keep a small group’s supply of phones, tablets, Bluetooth speakers, and earbuds fully charged during a camping trip. It may even be used, by the lazy among us, to power the pump utilized to inflate an air mattress. For longer trips, this device can be recharged using a compatible set of solar panels. For those that cheat and bring along their vehicle, the BR300 may be connected, via the supplied adapter, to their car’s charger port. This device includes built-in lights used for reading and, if the user is hopelessly lost, can flash an SOS signal in Morse code.

Power Failure

The Joyzis BR300 will keep your phone and tablet charged and, if you cannot live without the internet, your router may be plugged into this power station’s AC outlet. Those—like myself—who thrive on coffee will be disappointed by the BR300’s inability to power a tea kettle or a coffee machine. These greedy devices demand far more power than can be delivered. This device, however, can provide sufficient power to run a portable radio, lights, and laptops.

The Portable Projector

Portable projectors are rapidly becoming a hot item, mainly because you can lug them into the backyard and convert the side of your house into an outrageously huge screen. While a few portable projectors are equipped with internal batteries, they are seldom powerful enough to last the length of a two-hour movie. The BR300, happily, can perform this task. In my test, I connected the power station to my home projector. It demands 130W. By the end of the 104-minute movie, the battery level had dropped to 25 percent. The BR300 could have powered this projector for two hours and, if connected to a less power-hungry portable projector, would have performed even better.

Overall Assessment

This power station is an extremely useful and versatile device. It can be used to charge phones and tablets during camping trips or power failures. Those who suffer from sleep apnea may use this device as their CPAP machine’s backup power supply. It also serves as a handy power source for portable projectors and other devices used outdoors. The Joyzis Portable Power Station is recommended. Walter Shillington Joyzis is offering a $110.00 discount on this power station valid until February 23. This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional. © 2022 Walter Shillington

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