Onn 20,000mAh Facts: 140 Specifications & 30 Highlights
From battery life to connectivity, we reviewed 140 specs & features in the Onn 20,000mAh power bank — with user-backed favorites like general information, battery & capacity, charging input performance & power output performance.
Supermod 
Moderator 
Highlights 30
No extras. Just what matters.Why is Onn 20,000mAh better than other power banks ?
General Information
- 5.96 °F higher maximum operating temperature113.0 °F vs 107.0 °F
- Product Type: Power Bank
- Well Suited for Smartphone Charging,Tablet Charging,Travel Backup,Emergency Power
- Released in 2021
- Manufactured in China
- Finish Type: Matte
- Storage Temperature Range: 32–113°F
Battery & Capacity
- 9,664.38 mAh higher battery capacity20,000.0 mAh vs 10,335.6 mAh
- 1.05 Volt higher battery voltage5.0 Volt vs 4.0 Volt
- 11,011.87 mAh higher rated capacity20,000.0 mAh vs 8,988.1 mAh
- 21.01 Watt higher energy rating74.0 Watt vs 53.0 Watt
- Cycle Life Rating: 300–500 Cycles
- Battery Cell Type: Cylindrical
- Battery Chemistry: Lithium-Ion
- Has 6 Cells
- Battery Configuration: Series-Parallel Configuration
- 4.95 % lower self-discharge rate5.0 % vs 9.9 %
- 1.03 Watt lower standby power loss0.5 Watt vs 1.5 Watt
Charging Input Performance
- 0.63 Amp higher input current rating3.0 Amp vs 2.4 Amp
- 4.72 % higher charging efficiency90.0 % vs 85.3 %
- Input Port Type: USB-C, USB-A
- Has 1 Input Ports
- Input Voltage Range: 5–20V
Power Output Performance
- 0.26 Watt higher maximum output power20.0 Watt vs 19.7 Watt
- Output Port Type: USB-C, USB-A
Physical Dimensions & Weight
- 0.59 inch slimmer depth1.4 inch vs 2.0 inch
- 0.79 inch narrower width3.0 inch vs 3.8 inch
- 2.26 inch shorter height0.9 inch vs 3.2 inch
Build Materials & Durability
- 0.26 ft higher drop resistance height3.0 ft vs 2.7 ft
Environmental & Efficiency
- 4.52 % higher energy conversion efficiency90.0 % vs 85.5 %
Quick Take
The essentials that matter—nothing extraA fast snapshot of the Onn 20,000mAh, covering its standout specification and what you can expect right out of the box.
Onn 20,000mAh is a high-capacity portable power bank (battery pack) used to charge smartphones, tablets, and other USB devices on the go, equipped with multiple ports (USB-C & USB-A), 20W fast charging, and an LED display to show remaining power, sold primarily at Walmart.
Specifications & Facts 140
Specs measured. Drama avoided.Think you know gadgets? Check out the full scoop on the Onn 20,000mAh power bank: specs, votes, pros, cons, and how it measures up to competing power banks.
General Information 10
Onn 20,000mAh Operating Temperature Minimum
What is the minimum operating temperature?
The minimum operating temperature is 32°F, equivalent to 0°C, allowing usage in typical indoor and many outdoor environments.
Defines the lowest ambient temperature the power bank can operate safely.
Onn 20,000mAh Operating Temperature Maximum
What is the maximum operating temperature?
The maximum operating temperature is 113°F, which is 45°C, supporting safe function in warm environments.
Defines the highest ambient temperature the power bank can operate safely.
Onn 20,000mAh Product Type
What is the product type?
55 Onn 20,000mAh 0 Votes Power Bank
6 Power Banks in this range Power Bank
Identifies the functional category of the portable charging device.
Onn 20,000mAh Intended Use Case
What is the intended use case?
59 Onn 20,000mAh 0 Votes Smartphone Charging, Tablet Charging, Travel Backup, Emergency Power
6 Power Banks in this range Smartphone Charging, Tablet Charging, Travel Backup, Emergency Power
Describes the primary usage scenarios the power bank is designed for.
Onn 20,000mAh Release Year
What is the release year?
65 Onn 20,000mAh 0 Votes 2021
9 Power Banks in this range 2024
Indicates the year the product was first released to market.
Onn 20,000mAh Country of Origin
Where is this product made?
65 Onn 20,000mAh 0 Votes China
7 Power Banks in this range China
States the country where the product is manufactured or assembled.
Battery & Capacity 14
Onn 20,000mAh Battery Capacity
What is the battery capacity?
The battery capacity is 20,000 mAh, providing substantial charge capacity for multiple recharge cycles of typical smartphones.
States the total energy storage capacity of the battery cells.
Onn 20,000mAh Battery Voltage
What is the battery voltage?
The battery voltage is 5 volts, typical for portable USB power solutions.
Indicates the nominal voltage of the battery pack.
Onn 20,000mAh Rated Capacity
What is the rated capacity?
The rated capacity matches the battery capacity at 20,000 mAh, representing the charge available under normal use.
Indicates the usable output capacity after conversion losses.
Onn 20,000mAh Energy Rating
What is the energy rating?
Energy rating of 74 watts likely relates to power consumption or battery energy storage capacity.
Measures total energy stored expressed in watt-hours.
Onn 20,000mAh Cycle Life Rating
What is the cycle life rating?
45 Onn 20,000mAh 0 Votes 300–500 Cycles
5 Power Banks in this range 300–500 Cycles
Battery cycle life is estimated between 300 to 500 cycles, indicating the expected usable lifespan before significant capacity loss.
Indicates the estimated number of full charge cycles the battery can complete before noticeable capacity degradation.
Onn 20,000mAh Battery Cell Type
What type of battery cell does it use?
75 Onn 20,000mAh 0 Votes Cylindrical
7 Power Banks in this range Pouch
Indicates the physical form factor of the battery cells used.
Charging Input Performance 10
Onn 20,000mAh Maximum Input Power
What is the maximum input power?
Maximum input power is rated at 18 watts, supporting rapid recharging of the power bank itself.
Shows the maximum power the power bank can accept while charging.
Onn 20,000mAh Input Current Rating
What is the input current rating?
The input current rating is 3 amps, enabling relatively fast charging of the power bank.
Defines the maximum current the power bank can draw during charging.
Onn 20,000mAh Charging Efficiency
What is the charging efficiency?
Charging efficiency is rated at 90%, indicating efficient energy transfer during the charging process.
Measures how efficiently input power is converted to stored energy.
Onn 20,000mAh Charging Time
How long does it take to fully recharge?
Charging time is approximately 6 hours, reflecting the duration required to fully recharge the power bank.
Estimates total time required to fully recharge the power bank.
Onn 20,000mAh Input Port Type
What input port types are supported?
70 Onn 20,000mAh 0 Votes USB-C, USB-A
8 Power Banks in this range USB-C
Identifies the physical port types used to recharge the power bank.
Onn 20,000mAh Input Port Count
How many input ports does it have?
5 Onn 20,000mAh 0 Votes 1
1 Power Banks in this range 1
Indicates how many input ports are available for charging.
Power Output Performance 14
Onn 20,000mAh Maximum Output Power
What is the maximum output power?
Maximum output power is rated at 20 watts, sufficient for fast charging many smartphones and smaller tablets.
Shows the highest power level supported by a single output.
Onn 20,000mAh Total Output Power
What is the total output power?
Total output power capacity is 20 watts, suitable for fast charging compatible devices.
Measures the combined power available when using multiple ports.
Onn 20,000mAh Output Port Type
What output port types are available?
70 Onn 20,000mAh 0 Votes USB-C, USB-A
8 Power Banks in this range USB-A, USB-C
Identifies the physical ports used to deliver power to devices.
Onn 20,000mAh Output Port Count
How many output ports does it have?
0 Onn 20,000mAh 0 Votes 3
0 Power Banks in this range 2
Indicates how many devices can be physically connected at once.
Onn 20,000mAh Output Voltage Range
What output voltage range is supported?
0 Onn 20,000mAh 0 Votes 5–12V
0 Power Banks in this range 5V
Defines the voltage levels supported for device charging.
Onn 20,000mAh Output Current Rating
What is the output current rating?
Represents the power delivery capability under load conditions.
Charging Protocols & Compatibility 12
Onn 20,000mAh USB Power Delivery
Does it support USB Power Delivery?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates support for the USB Power Delivery fast charging standard.
Onn 20,000mAh Quick Charge
Is Quick Charge supported?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Confirms compatibility with Qualcomm Quick Charge standards.
Onn 20,000mAh Programmable Power Supply
Does it support PPS charging?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates support for Programmable Power Supply charging.
Onn 20,000mAh Apple Charging Compatibility
Is it compatible with Apple devices?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Ensures optimized charging for Apple devices.
Onn 20,000mAh Samsung Charging Compatibility
Is it compatible with Samsung devices?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Confirms optimized charging for Samsung devices.
Onn 20,000mAh Laptop Charging
Can it charge laptops?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates ability to charge laptops via USB-C output.
Physical Dimensions & Weight 6
Onn 20,000mAh Depth
What is the depth?
The depth dimension is 1.42 inches, equivalent to about 3.61 cm, contributing to its slim profile.
Measures the front-to-back thickness of the power bank.
Onn 20,000mAh Weight
How much does it weigh?
The weight of the power bank is 0.81 lbs, equivalent to approximately 0.37 kg, making it lightweight and portable.
Indicates how heavy the power bank is for portability.
Onn 20,000mAh Width
What is the width?
Width measures 3 inches, or roughly 7.62 cm, making it comfortably pocketable.
Measures the horizontal size of the power bank.
Onn 20,000mAh Height
What is the height?
The height of the device is 0.9 inches, about 2.29 cm, contributing to its sleek form factor.
Measures the vertical dimension of the power bank.
Onn 20,000mAh Pocket-Friendly Design
Is it pocket-friendly?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates whether the size is suitable for pocket carry.
Onn 20,000mAh Travel-Friendly Size
Is it travel-friendly?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates suitability for travel and carry-on use.
Build Materials & Durability 10
Onn 20,000mAh Drop Resistance Height
What drop height can it survive?
Drop resistance height is 3 feet, or approximately 91.44 cm, suggesting moderate durability against accidental drops from typical hand height.
Specifies the maximum drop height the device can withstand.
Onn 20,000mAh Outer Shell Material
What is the outer shell material?
0 Onn 20,000mAh 0 Votes Plastic
0 Power Banks in this range Plastic
Specifies the primary material used for the exterior housing.
Onn 20,000mAh Internal Frame Material
What is the internal frame material?
0 Onn 20,000mAh 0 Votes Plastic
0 Power Banks in this range Plastic
Describes the internal structural material supporting the battery cells.
Onn 20,000mAh Impact Resistance Rating
What is the impact resistance rating?
0 Onn 20,000mAh 0 Votes Moderate Impact Resistance
0 Power Banks in this range Moderate Impact Resistance
Indicates the ability of the power bank to withstand shocks and physical impacts.
Onn 20,000mAh Heat Resistance
Is the power bank heat resistant?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates whether the power bank is designed to withstand elevated internal and external temperatures without performance degradation.
Onn 20,000mAh Fire Retardant Materials
Does it use fire-retardant materials?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates use of flame-resistant materials in construction.
Display, Indicators & Controls 10
Onn 20,000mAh Indicator Accuracy
How accurate is the battery indicator?
Indicator accuracy is rated at 5%, ensuring reasonably precise battery status readings.
Measures how accurately the indicator reflects actual remaining power.
Onn 20,000mAh Display Type
What type of display does it have?
0 Onn 20,000mAh 0 Votes LED Indicator
0 Power Banks in this range LED Indicator
Specifies the type of display used to show power information.
Onn 20,000mAh User Feedback Alerts
What user alerts are available?
0 Onn 20,000mAh 0 Votes LED Light
0 Power Banks in this range LED Light
Indicates how the device provides user feedback and alerts.
Onn 20,000mAh Battery Level Indicator
Does it show battery level?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates whether the power bank shows remaining battery level.
Onn 20,000mAh Remaining Time Display
Does it display remaining time?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Shows estimated remaining usage or charging time.
Onn 20,000mAh Button Type
What type of button does it use?
0 Onn 20,000mAh 0 Votes Physical Button
0 Power Banks in this range Physical Button
Describes the type of button used for control.
Safety & Protection Features 14
Onn 20,000mAh Short Circuit Protection
Does it have short circuit protection?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Prevents damage when a short circuit is detected.
Onn 20,000mAh Overcurrent Protection
Is overcurrent protection supported?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Protects devices from excessive current flow.
Onn 20,000mAh Overvoltage Protection
Does it include overvoltage protection?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Prevents voltage levels from exceeding safe limits.
Onn 20,000mAh Thermal Protection
Does it have thermal protection?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Shuts down or limits power when overheating is detected.
Onn 20,000mAh Temperature Monitoring
Is temperature monitored internally?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Continuously monitors internal temperature.
Onn 20,000mAh Foreign Object Detection
Does it detect foreign objects?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Detects abnormal objects or unsafe connections.
Thermal Management & Cooling 12
Onn 20,000mAh Thermal Management System
Does it have a thermal management system?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates whether the power bank includes an integrated thermal management system.
Onn 20,000mAh Heat Dissipation Method
How does it dissipate heat?
0 Onn 20,000mAh 0 Votes Passive Cooling, Heat Spreader
0 Power Banks in this range Passive Cooling
Describes how heat is dispersed away from internal components.
Onn 20,000mAh Internal Heat Sink
Is there an internal heat sink?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates the presence of an internal heat sink to absorb and spread heat.
Onn 20,000mAh Thermal Sensor Count
How many thermal sensors are used?
0 Onn 20,000mAh 0 Votes 1
0 Power Banks in this range 1
Specifies how many thermal sensors are used for temperature monitoring.
Onn 20,000mAh Thermal Throttling
Does it support thermal throttling?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Reduces power output automatically to prevent overheating.
Onn 20,000mAh Thermal Cutoff Threshold
At what temperature does it shut down?
Indicates the temperature at which the system shuts down to prevent damage.
Connectivity & Smart Features 8
Onn 20,000mAh Bluetooth Connectivity
Does it support Bluetooth connectivity?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates whether the power bank can connect wirelessly to other devices.
Onn 20,000mAh App Support
Is there app support?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Confirms whether a companion mobile app is available.
Onn 20,000mAh Firmware Upgradable
Can the firmware be updated?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates whether firmware can be updated to improve functionality.
Onn 20,000mAh Smart Power Monitoring
Does it offer smart power monitoring?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Provides real-time monitoring of power flow and usage.
Onn 20,000mAh Device Usage Analytics
Does it provide usage analytics?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Tracks connected device charging behavior and patterns.
Onn 20,000mAh Charging History Tracking
Is charging history tracked?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Records past charging sessions for review.
Environmental & Efficiency 6
Onn 20,000mAh Energy Conversion Efficiency
What is the energy conversion efficiency?
The energy conversion efficiency is 90%, meaning the power bank effectively converts stored energy to device power with minimal loss.
Measures how efficiently stored energy is converted into usable output power.
Onn 20,000mAh Idle Power Consumption
How much power is used while idle?
Idle power consumption is 0.5 watts, representing energy use when the device is on but not actively charging.
Indicates how much power is consumed when the power bank is not actively charging devices.
Onn 20,000mAh Eco Mode
Does it support eco mode?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Enables reduced power usage to improve efficiency and battery longevity.
Onn 20,000mAh Automatic Power Optimization
Does it optimize power automatically?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Automatically adjusts output to reduce energy waste.
Onn 20,000mAh Sustainable Materials
Does it use sustainable materials?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates use of environmentally friendly or recycled materials.
Onn 20,000mAh Recycling Program
Is a recycling program supported?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates manufacturer support for recycling or take-back programs.
Included Accessories & Packaging 8
Onn 20,000mAh Cable Length
What is the cable length?
The included cable length is 1 ft which is approximately 30.48 cm—a compact length suitable for close-range charging setups.
Specifies the length of the included charging cable.
Onn 20,000mAh Package Width
What is the package width?
The package width is 4 inches, or approximately 10.16 cm, indicating a compact packaging size.
Measures the width of the retail packaging.
Onn 20,000mAh Package Depth
What is the package depth?
Package depth is 2 inches, around 5.08 cm, indicating the compact packaging profile.
Measures the depth of the retail packaging.
Onn 20,000mAh Package Height
What is the package height?
The package height is 6 inches or about 15.24 cm, providing a sense of the product's packaging dimensions.
Measures the height of the retail packaging.
Onn 20,000mAh Charging Cable
Is a charging cable included?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates whether a charging cable is included in the box.
Onn 20,000mAh Carrying Case
Is a carrying case included?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates whether a protective carrying case is included.
Warranty & Support 6
Onn 20,000mAh Warranty Length
How long is the warranty?
0 Onn 20,000mAh 0 Votes 12 Months
0 Power Banks in this range 12 Months
Indicates the duration of the manufacturer warranty.
Onn 20,000mAh Battery Warranty Coverage
Is the battery covered by warranty?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates whether the battery itself is covered under warranty.
Onn 20,000mAh Technical Support Availability
Is technical support available?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Confirms access to technical support services.
Onn 20,000mAh Support Channels
What support channels are available?
0 Onn 20,000mAh 0 Votes Email, Phone, Live Chat
0 Power Banks in this range Email, Phone
Lists available customer support contact methods.
Onn 20,000mAh Replacement Policy
Is there a replacement policy?
Yes 0Votes Onn 20,000mAh
Yes Power Banks in this range
Indicates eligibility for replacement in case of defects.
Onn 20,000mAh Repair Service Availability
Are repair services available?
No 0Votes Onn 20,000mAh
Yes Power Banks in this range
Confirms whether repair services are offered.
Surveys
Because hot takes deserve votes.Onn 20,000mAh Charging Speed Performance
How fast does this power bank recharge devices in everyday use?
Onn 20,000mAh Battery Capacity Satisfaction
How satisfied are you with the battery capacity of this power bank for daily needs?
Onn 20,000mAh Output Power and Device Support
How well does this power bank handle charging different devices at once?
Onn 20,000mAh Port Selection and Flexibility
How flexible is this power bank when it comes to charging ports?
Onn 20,000mAh Size and Portability
How easy is this power bank to carry around daily?
Onn 20,000mAh Build Quality and Durability
How durable does this power bank feel during regular use?
Onn 20,000mAh Charging Stability
How stable is the charging output from this power bank during use?
Onn 20,000mAh Heat and Safety Performance
How well does this power bank control heat during charging and heavy use?
Onn 20,000mAh Battery Efficiency
How efficiently does this power bank convert stored energy into usable charging power?
Onn 20,000mAh Travel Friendliness
How convenient is this power bank for travel and daily commuting?
Reviews 0
The good, the bad, and the brutally honest.Average Rating
Discussions 0
Thoughts, takes, and hot debates.Awards 0
Only the best made it here.Collections 0
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