Both of mine were made in China, mine are the smaller ones that I use to power a camera that won't draw enough current to keep other batteries from shutting down.

Can you connect 2 units together for double the charge ?

Hello - if you mean double the capacity, we would suggest using the V50 - https://www.amazon.com/Voltaic-Systems-Always-External-Battery/dp/B00XZ7YU4M/ If you mean double the current (4A), it is possible with something like this "splitter" cable - https://www.amazon.com/HIGHROCK-Enhancer-Female-Charge-Extension/dp/B00NIGO4NM/r

How do you know when it's fully charged ?

If connected to a power source like USB or a 5 or 6 Volt solar panel, the lights will blink when charging. When fully charged, all 4 LEDs will turn solid.

Can I plug in into a wall outlet & keep drawing power from it always? I do not have any solar need. Any other product recommendation for my purposes?

Yes, the V25 has "pass through charging." It can accept a full charge and discharge at the full rate at the same time. If your power shuts off, there is no lag in power to your device. Customers do use it as a UPS.

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V25

Product ID: 582732962

Details

Battery Capacity
6700 Milliamp
Brand
Voltaic
Color
Silver
Connector Type
USB Type C
Special Feature
Always On

⚡5V/2A output

🌞Solar optimized cells

🔋6,400mAh capacity

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€ 104.73

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Power your adventures, never miss a moment!

DUAL OUTPUT - Charge two devices simultaneously with 3A max output.
SOLAR READY - Harness the sun's energy with high-quality Li-ion cells.
POWER UP ANYWHERE - Stay charged with 1.5 smartphone charges on the go!
ALWAYS ON CONVENIENCE - Perfect for sensors and time-lapse applications.
VERSATILE COMPATIBILITY - Works seamlessly with iPhone, iPad, Samsung, and more.

The V25 6,400mAh USB Always On Battery Backup Power Bank is designed for the modern professional, providing reliable power for smartphones and tablets. With solar-optimized Li-ion cells, dual output capabilities, and an 'Always On' feature, this power bank ensures you stay connected and charged, no matter where your day takes you.

Specifications

ASIN	B07ZS3WYZY
Amperage	2 Amps
Antenna Location	Solar Devices
Battery Capacity	6700 Milliamp Hours
Battery Cell Type	Lithium Ion
Battery Weight	230 Grams
Best Sellers Rank	#150,437 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #1,890 in Cell Phone Portable Power Banks
Brand	Voltaic Systems
Color	Silver
Compatible Devices	Arduino, Hearing Aid, Raspberry Pi, Smartphone
Connector Type	USB Type C
Customer Reviews	4.5 out of 5 stars 174 Reviews
Item Dimensions	3.15 x 3.22 x 0.95 inches
Item Dimensions L x W x Thickness	3.15"L x 3.22"W x 0.95"Th
Manufacturer	Voltaic Systems
Mfr Part Number	V25
Model Number	V25
Number of Batteries	1 Nonstandard Battery batteries required.
Number of Items	1
Number of Ports	5
Other Special Features of the Product	Always On, Solar Charging
Power Source	Solar Powered
Reusability	Rechargeable
Special Feature	Always On, Solar Charging
Unit Count	1.0 Count
Voltage	5 Volts
Warranty Description	1 Year Manufacturer

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