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A full charge of HG 4000 mAh solar power bank can top up a typical smartphone 1.5 - 2.5 times, depending on type of phone/battery. For more on this see our “What capacity should you buy?” section of our QC pageHetoGrow solar power banks are especially designed to recharge mobile phones with USB cables and provide highly efficient and renewable LED flashlight. They provide safe and sustainable bright light after charging with either sunlight or electricity. Each universal solar power bank is supplemented by the embedded solar panel during the day. This provides solar support and emergency power back up as it recharges the power bank on exposure to the sun. The product is designed to support mobile phones and up to 5V devices where there is no access to electricity. It is mobile ready and ideal in emergency situations like when outdoors in remote places, travelling, camping or even at a business summit.

HetoGrow universal solar power banks are equipped with in built extra overcharge protection and anti discharge technology that retains power for well over 12 months when fully charged. For information about how to charge a power bank and how to charge a phone with a power bank,  see the user manual page. You deserve the best.

Product Information

This is new style dual USB output REAL 4000 mAh universal solar power bank. Portable, safe, dust and shock proof, anti-slip, and reliable; perfect for using while travelling, camping and other outdoor and indoor activities. Compatible with all USB mobile phones, tablets, note pads and other electronic devices up to 5V. High output LED flashlight with 5 LED bulbs that show the indicative power level and progressive charging status. Long lifespan with 500-1000 times charging capacity with discharging protection. Can retain power for over 12 months if fully charged. Enjoy charging anytime and anywhere with emergency solar panel charging. 

HetoGrow Solar Power Bank Guarantee

We offer up to 12 months warranty split into 3 months automatic standard warranty extendable for a further 9 months. Before using the product, it is strongly advised that you read the User Guidance and Caution notes at the back of the pack. You can download updated copy online from the warranty page at Also, as with new mobile phones, it is strongly recommended that you charge your product for at least 6 hours, perhaps overnight, before first use. This ensures optimal performance for your enjoyment. 

Key Features

  • 2 USB connections to charge 2 devices at once
  • Revolver loop transfer of charge across power banks 
  • 4000 mAh Solar Charger External Battery Power Bank with Li-Polymer battery
  • Charge a typical smartphone 1.5 - 2.5 times, depending on type of phone/battery
  • Fast charging capability with USB 2.0 cable included in pack.
  • Extra overcharge protection and anti-discharge technology.
  • Robust design suitable for multiple purposes.
  • With dual USB and micro USB ports.
  • Emergency LED torch, the LED flashlight works perfectly in darkness, especially for emergency.
  • 5 LED status of charge bulbs indicate progressive charging and discharging
  • If solar charging, 1 green bar comes on
  • Press power button to see progressive charge level
  • Environmentally friendly silica gel and ABS+PC materials, and rubber paint surface process
  • Compact, portable & stylish design.


  • Charge time: depends on brightness of the sun and exposure. Expect to charge over a couple of days with solar panel or 3-6hrs (best overnight) for USB charging especially before first time use. Recharge a standard smartphone in 1-2 hours
  • Battery Capacity: 4000 mAh Li-polymer battery
  • Solar PV: up to 4w in ideal situations and up to 2w on average depending on exposure to sunlight
  • If solar charging, LED bulbs indicate progressive levels of charge. Press power button to see charge level 
  • Input:  5V/1A    
  • Output: 5V/1A;5V/2.1A
  • Product size: 144*74*14 mm
  • Operating Temperature: 0-45 degrees
  • Compatibility: iPhone, iPad, Android phone & other 5V USB gadgets like smartwatch, GPS device, camera, etc
  • Certification: CE, FCC, RoHS, UN38.3, SONPC1

Package includes

  • 1 x Solar Charger
  • 1 x Micro USB charging cable
  • 1 x Warranty card

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Solar Power Bank 4000 mAh Green and Black

  • Brand: HetoGrow
  • Product Code: 4KGB
  • Availability: In Stock
  • ₦4,000.00

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