OUPES B5 Smart Extra Battery - 5040Wh LiFePO4 Expansion Battery for Mega 5 Portable Power Station Scalable to

OUPES

OUPES B5 Smart Extra Battery - 5040Wh LiFePO4 Expansion Battery for Mega 5 Portable Power Station Scalable to

587+ bought in the past month

$1499.00

About this item

  • Expand Your Power – Add 5040Wh LiFePO4 capacity to OUPES Mega 5, scaling total power up to 45.36kWh with 8 B5 batteries.
  • Ultimate Backup Solution – Keep homes, appliances, and devices running during blackouts, storms, or off-grid adventures.
  • Military-Grade Durability – Rugged LiFePO4 battery with 3-year warranty, engineered for extreme temperatures and long lifespans.
  • Effortless Portability – Compact 25.2"x11.9"x17.2" design at 97 lbs – easy to transport for camping, RV trips, or outdoor events.
  • Professional-Grade Support – Powers cameras, drones, and high-wattage gear for photographers, filmmakers, and field crews.
  • Seamless Integration – Plug-and-play connectivity with Mega 5 host for instant capacity boost (sold separately).
  • Safe & Reliable – Advanced BMS protects against overcharging, short circuits, and overheating for worry-free use.
  • Eco-Friendly Energy – Clean, silent power for off-grid living, replacing noisy gas generators.
$1499.00

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Product details

BrandOUPES
Wattage5040 Watt-hours
Fuel TypeBattery
Power SourceBattery Powered
Recommended Uses For ProductBackup power, Blackout, Off-grid power
Item Weight97 Pounds
Voltage120 Volts (AC)
Output Wattage5040
Special FeatureScalable to 45.36kWh, Smart APP Control
Included Components1x B5 Smart Extra Battery, 1x Extra Battery Cable, 1x User Manual

Technical specifications

brandOUPES
wattage5040 Watt-hours
fuel_typeBattery
power_sourceBattery Powered
recommended_uses_for_productBackup power, Blackout, Off-grid power
item_weight97 pounds
voltage120 Volts (AC)
output_wattage5040
special_featureScalable to 45.36kWh, Smart APP Control
included_components1x B5 Smart Extra Battery, 1x Extra Battery Cable, 1x User Manual
colorBlack
product_dimensions25.2"L x 11.9"W x 17.2"H
materialPlastic
model_nameB5 Smart Extra Battery
total_power_outlets3
eu_spare_part_availability_duration5 Years
starting_wattage5040 Watts
manufacturerSHENZHEN WEI PENG SHIJI TECHNOLOGY CO., LTD
part_numberS5
item_model_numberS5
styleB5 Extra Battery
special_featuresScalable to 45.36kWh, Smart APP Control
warranty_description5-year warranty
best_sellers_rank#174,357 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #564 in Outdoor Generators
date_first_availableMarch 26, 2025

Product videos

Product video 1

Customer reviews

4.216 ratings

Customers say

Customers find the battery's power generation capabilities positive, with one mentioning it works perfectly with solar panels.

★★★★★

Reliable battery

Customer—October 23, 2025

Oupes is a reliable and reputable company. They provide many solar options and, generally, for a good price. This item is an extra battery that connects to the main battery and acts as an expansion. It comes with the appropriate cord that easily connects to the main unit. The main unit, often referred to as a generator, is not a generator. It generates no power. It is a battery-stores solar energy (much like a Duracell or Energizer battery stored power for later use). This extra battery multiples your storage significantly. If you own any Oupes Mega series unit, this battery is compatible. If you don’t own one, I strongly recommend getting one! When you order your main unit and extra battery, grab some solar panels (Oupes does offer combo purchases) and an extension cord. Properly set up, the units charge fast. Oupes provides excellent support and even produces YouTube videos for additional information and support. Enjoy! Read more

★★★★★

This is already saving me mney

Kraig R. Adamson—December 9, 2025

The battery works great, I bought the MEGA1 a few months ago and it saved me lots. I live off-grid and now I only need to run my generator once a day with the addition of the B3 battery. Read more

★★★★☆

Recommend

Grace—January 5, 2026

We bought this to start building our solar system for our house. So far it has been excellent. Can't wait to see the reduction in electric use. I gave a 4 star because the main system had issues and we had to return it to the manufacturer, but they responded quickly and are replacing it. Read more

★★★★★

reliable

Design & Remodel Brothers—July 16, 2025

Wonderful product! We use it for the farmers market and its wonderful! Read more

★★☆☆☆

Overstated capacity

George Joachim—December 22, 2025

No where near the listed watt hours Read more

★★★★★

Que es muy buena

Rogelio Carnet Prado—October 23, 2025

Excelente Read more

★☆☆☆☆

not Right For My Company.

Rob H.—October 25, 2025

After 2 weeks of buying a Mega 1 it died. Nothing we tried could get it to work, and unfortunately our business relies on solar generators. If one breaks our operations close down. I bought this new model with such excitement— but in a short time it was tossed out because it didn’t work. I tried to work with OUPES, but it was as Amazon that came to the rescue. Read more

★★★★☆

must buy

Derrick Jones—April 28, 2025

must buy Read more

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