UGREEN DymondCell™ Battery Technology
A power bank built to pass the toughest safety requirements.
In a train packed to 200% capacity, a power bank can be subjected to around 40kg of pressure. This pressure can gradually damage the battery internally. In a train packed to 200% capacity, a power bank can be subjected to around 40kg of pressure. This pressure can gradually damage the battery internally.
Power banks are strictly regulated by airlines and must be carried in your cabin baggage. Power banks are strictly regulated by airlines and must be carried in your cabin baggage.
Car interiors can exceed 60°C in summer, increasing the risk of battery overheating and swelling. Car interiors can exceed 60°C in summer, increasing the risk of battery overheating and swelling.
Heat can build up more easily, increasing the risk of thermal runaway, battery degradation. Heat can build up more easily, increasing the risk of thermal runaway, battery degradation.
Contact with keys, coins, or other metal objects can short-circuit the terminals and create a fire risk. Contact with keys, coins, or other metal objects can short-circuit the terminals and create a fire risk.
Safety risks often hide where you can’t see them.
Safety risks often hide where you can’t see them.
（20000mAh・45w ・Silver）
（20000mAh・45w ・Dark Grey）
（10000mAh・45w ・Dark Grey）
The safety and reliability of a power bank depend above all on the quality of its internal cells and how they are designed.
Yet many designs focus on protection for “what if” situations rather than eliminating the underlying risks of thermal runaway and fire.
Semi-solid batteries, protective features, flame-retardant materials... Brands have explored many ways to make power banks safer.
But true safety means designing out risk from the start, rather than trying to contain it after the fact.
So how do you build that kind of safety into the product?
The safety and reliability of a power bank depend above all on the quality of its internal cells and how they are designed.
Yet many designs focus on protection for “what if” situations rather than eliminating the underlying risks of thermal runaway and fire.
Semi-solid batteries, protective features, flame-retardant materials... Brands have explored many ways to make power banks safer.
But true safety means designing out risk from the start, rather than trying to contain it after the fact.
So how do you build that kind of safety into the product?
UGREEN asked a simple question: Is there a way to stop risks before they even begin?
Dymondcell™ was born from that question.
It uses high-quality ATL battery cells, also used in Apple products, with an extremely low swelling rate and a high energy density of 773Wh/L. This helps minimize the risk of fire caused by internal swelling while keeping the power bank lightweight, combining a high level of safety with everyday convenience.
In laboratory testing, the battery did not ignite when pierced with a 4mm nail, subjected to 2.5 tons of pressure, or heated to 135°C. Its impact- and heat-resistant design helps prevent fires at the source, while 14 additional protection features provide safeguards for unexpected situations.
UGREEN takes your safety seriously.
UGREEN asked a simple question: Is there a way to stop risks before they even begin?
Dymondcell™ was born from that question.
It uses high-quality ATL battery cells, also used in Apple products, with an extremely low swelling rate and a high energy density of 773Wh/L. This helps minimize the risk of fire caused by internal swelling while keeping the power bank lightweight, combining a high level of safety with everyday convenience.
In laboratory testing, the battery did not ignite when pierced with a 4mm nail, subjected to 2.5 tons of pressure, or heated to 135°C. Its impact- and heat-resistant design helps prevent fires at the source, while 14 additional protection features provide safeguards for unexpected situations.
UGREEN takes your safety seriously.
* ATL cells are included only in the 10,000mAh model.
* Figures are based on laboratory testing. These tests were conducted under controlled conditions. Do not subject the product to impact, pressure, or heat yourself.
To ensure long-term safety and reliability, Dymondcell™ undergoes comprehensive testing designed to go far beyond everyday use.
Key Focus：Evaluates safety when subjected to severe external mechanical damage.
Test Method：A steel nail is driven through the battery cell to force an internal short circuit. Temperature rise, smoke, fire, and explosion risks are monitored.
Test Result：No fire was detected even after being pierced three times with a 4mm nail. A fire-resistant insulating layer forms inside the battery to help prevent ignition.
Key Focus：Evaluates resistance against deformation and internal short circuits.
Test Method：The cell is pressed under a specified heavy load.
Test Result：Withstood 25 kN (approx. 2.5 tons) with only minor dents, showing no explosion or fire.
Key Focus：Evaluates the risk of internal short circuits and fire caused by dendritic lithium metal deposits inside the battery.
Test Method：Monitors capacity retention in lithium-ion batteries during active use.
Test Result：No abnormalities observed even after 800 charge cycles.
Key Focus：Evaluates the risk of fire or explosion when charged at a voltage and current higher than the battery's rated specs.
Test Method：Continuous charging at a constant voltage higher than the standard charge voltage.
Test Result：After reaching full charge, continuous overcharging at 1.3 times constant voltage for 7 hours resulted in no explosion or fire.
Key Focus：Evaluates heat resistance when exposed to abnormally high temperatures, such as inside a car in direct sunlight or near heating appliances in winter.
Test Method：Exposed to temperatures far higher than standard operational limits.
Test Result：Heated at 140°C for 1 hour with no explosion or fire.
* The product shown is the 10,000mAh model. Actual product appearance and specifications may vary. Please refer to the product received.
From commuting to work or school and days at the office to business trips, travel, the car, and home, Dymondcell™ power banks deliver dependable peace of mind.
UGREEN UGREEN
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