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Black rectangular power bank with two USB-A ports and USB-C plus micro-USB inputs

ENERGIZER

Energizer 20000mAh Power Bank Black USB-A 5V 2.1A

SKU CH-H2H4-26G03

A 20000mAh lithium-polymer power bank with dual USB-A outputs at 5V 2.1A, dual USB-C and micro-USB inputs, and PowerSafe protection for up to 73 hours of extra screen time

  • Battery TypePower Bank
  • High capacity keeps phones running with 20000mAh lithium polymer
  • 73 extra hours of screen time for a standard smartphone
  • 1A USB-A rapid charging powers devices quickly
  • Dual USB-A outputs charge two devices simultaneously
  • PowerSafe management protects against short circuit and over-charge

Capacity and use case

This Energizer power bank stores 20000mAh of lithium polymer energy, rated at 74Wh. It can charge a standard smartphone up to 6 times and provides an extra 73 hours of screen time. The single USB-A output delivers 5V at 2.1A for mobile charging. It suits users who need multi-day portable power without a wall socket.

Thermals noise and power

The unit operates silently with no moving parts and produces negligible heat during normal charging. It draws power only when recharging its internal cells through either the USB-C or micro-USB input. The 2.1A output limit keeps power draw predictable and within standard USB-A specifications. PowerSafe management protects against short circuit, over current, over charge and over discharge.

Build and connectivity

A black plastic enclosure houses the 20000mAh battery and two USB-A output ports that charge two devices simultaneously. Dual inputs — one USB-C and one micro-USB — let you replenish the bank using whichever cable you carry. No cables are included in the specifications. The design targets everyday carry and travel use where multiple device charging is required.

Highlights

  • High capacity keeps phones running with 20000mAh lithium polymer
  • 73 extra hours of screen time for a standard smartphone
  • 1A USB-A rapid charging powers devices quickly
  • Dual USB-A outputs charge two devices simultaneously
  • PowerSafe management protects against short circuit and over-charge

Specifications

Battery TypePower Bank

Questions about this item

How do I start charging my phone from the power bank, and what step do people often miss?

Connect your phone to either USB-A port using its cable; the power bank begins charging automatically, but you must press the power button first if the output does not activate.

What part of the power bank will wear out first and need replacement?

The internal lithium-polymer cells degrade after many charge cycles; when capacity drops noticeably, the whole unit must be replaced.

What limit appears first during continuous high-current charging?

The 2.1 A per USB-A port ceiling caps output, so a device that wants more current will charge at 2.1 A maximum.

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