Jackery Explorer 300 v2 review: a small bedside UPS for a router, phones or a CPAP

This is a research-based review, based on manufacturer specs and published data. We do not test products. Figures come from Jackery's Explorer 300 v2 product page, tech specs and FAQ, checked November 1, 2026, and from the ResMed, FDA and safety sources cited below.

Most outages are short. The ones that cause real trouble at night are the ones that knock out the internet, the phone chargers and a CPAP while everyone is asleep. The Explorer 300 v2 is built for that job: a lunchbox-size LiFePO4 battery that sits between the wall and your devices and, per Jackery, takes over in 0.01 seconds or less when the grid drops.

At 288 Wh and 300 W, it is a small-load tool. This review works out what that capacity covers, how it compares with a CPAP-specific battery, and one setting that matters for overnight use.

Who should buy it

• Households that want the modem, router and a VoIP adapter to ride through outages without a reboot. Jackery markets the UPS for exactly that.
• CPAP users who want a bedside backup and can sleep with the humidifier off during an outage, after checking with their DME supplier.
• Apartment dwellers who need light, phone charging and a fan for an evening.
• Anyone who wants a backup that is easy to carry: 8.16 lb with a folding handle.

Who should skip it

• Anyone who needs to run a refrigerator, sump pump or microwave. 300 W of output will not start them. Look at the BLUETTI AC180 class instead.
• Households planning for multi-day outages on solar. Solar input tops out at 100 W per Jackery, and the battery cannot be expanded.
• CPAP users who need a heated humidifier all night. On ResMed's and Champion's figures, that needs several times this capacity.

Strengths

• Fast UPS switchover. Jackery lists 0.01 seconds (10 ms) or less, quick enough for most network gear.
• LiFePO4 cells. Rated for 4,000 cycles to 70%+ capacity, with a UL94V-0 flame-retardant shell per Jackery.
• Fast recharge between outages. About 76 minutes to full from the wall, or 80% in about an hour.
• 12 V car port at 10 A. Useful for a CPAP DC converter or 12 V cable, which skips inverter losses.
• Continuous-output option. Jackery's energy-saving switch can be set so outputs do not shut off overnight.
• Light. 8.16 lb, 9.09 × 6.02 × 6.6 in.

Drawbacks

• Small capacity. 288 Wh runs a CPAP at ResMed's typical AirSense 11 power-supply figure for only about 4 hours through AC.
• Only two AC outlets at 300 W combined.
• Slow solar. Jackery quotes about 9.5 hours with a 40 W panel and panels up to 100 W, so solar is a top-up, not a daily refill.
• Auto-off can catch you out. With energy saving on, Jackery says outputs shut off after 6 hours below 25 W on AC or 2 W on USB/DC.
• Car cable not included, per Jackery's FAQ.

How it compares

The 300 v2 against a similar-size station, a CPAP-specific battery and a 1 kWh station. Figures are from each maker's page.

Using it in a long outage

What 288 Wh covers

Assume about 85% of rated capacity is usable through the AC outlets after inverter losses (our planning figure, not Jackery's). That is roughly 245 Wh.

Using it for a CPAP

1. 01Turn off the energy-saving auto-off, or choose the continuous-output option, before bed. A CPAP with the humidifier off can draw under 25 W, which would trigger the 6-hour shutoff.
2. 02Turn the humidifier and heated tube off on battery. That is the biggest single way to stretch runtime.
3. 03Prefer DC. A 12 V DC cable or the CPAP maker's approved DC converter on the 12 V car port avoids the losses of going DC to AC and back.
4. 04Do a trial night at home with the station unplugged from the wall, and note the remaining charge in the morning.
5. 05For more than one night, or with heat on, size up. Our best CPAP battery backup guide has the Wh math, and the Medistrom Pilot-24 Lite is the CPAP-specific option.

Using it for the internet

Plug the modem or fiber ONT and router into the two AC outlets, or into a power strip on one of them, and leave the station plugged into the wall full time. When the power drops, it takes over. Your provider's network still needs power outside your home, so a backed-up router helps only if the service itself is up. Our best battery backup for a WiFi router guide covers that limit.

Charging and storage safety

• Jackery lists charging at 32 to 113°F and discharging at 14 to 113°F. Keep it indoors in winter outages.
• NFPA warns that damaged lithium-ion batteries can overheat or catch fire. Stop using a unit that is swollen, cracked or hot to the touch, and recycle it.
• If you recharge from a generator, it runs outdoors only, more than 20 feet from windows, doors and vents (CDC), with battery CO alarms inside.