Clicky Product Review - Hand Warmers

Product Review - Hand Warmers

2019-12-26 00:00:32share:


Today, we're sharing product reviews about the 7800mAh Rechargeable Hand Warmer.



product-vipon:start
product-vipon:end

Discount: 30% code +10% Amazon coupon

Discounted Price: $17.99


This review covers the Jomst ZLS-A8 hand warmer/power bank I received through Vipon, shipped from Amazon. I own and regularly use many different power banks, but never one that is also a hand warmer.Would this be a power bank worth using, or just a gimmick and fail in my testing?


The box contains the hand warmer, a USB A to micro USB cable, a storage bag, instructions, and a thank-you card.



The warmer is a combination of white plastic and black rubber. The rounded edges make it comfortable to hold.Its size is a good fit to be held warming both hands of an adult. A little large for pants pockets, it works well in the front pocket of a hoodie or in a jacket pocket. I recruited a teenage helper for some hand photos:



Specifications:


Battery:7800 mAh

Charge:2A 5V

Discharge:2A 5V

Heat:95 to 130F in three levels, with a working time of 6 to 12 hours in a 68F test room.



There are three ports on the device, two inputs for charging the warmer and one output for powering other devices. The provided cable works for both charging and discharging.With a USB C input, the cable used for newer phones works with the device for charging and discharging. Needing only a single cable is a handy feature.


The single button controls heat and power bank functions. Double tap the button to turn on the USB output. The three indicator LEDs glow blue to show the power level.Hold the button >3 seconds for heating.Tapping the button moves through the Low – Medium – High heat ranges. The LEDs glow red to show the heat level. When the internal battery is completely discharged, the LEDs blink red/blue and the output and heat shut off.



When it arrived (cold from being on a delivery truck in winter) I immediately opened the box and activated heating mode. I expected to feel some slow warming, but I was wrong.The warmer heated quickly, reaching high heat that was almost, but not quite, too warm to hold. Holding it tightly in my hands I could tell the temperature dropped a little but this brought it to a comfortable holding temperature. Knowing it was not a gimmick but was a real handwarmer, I moved on to real testing.


Using a Fluke 59 Max+ IR thermometer (E=.96) in a 68F room, I measured the warmer's temperature in a few different scenarios:


  • Low level = 99 to 100F
  • Medium level = 107 to 111F
  • High level = 120 to 129F


Watching the temperature over a few minutes I could see it cycle slightly but only by a few degrees. I next placed the unit in the freezer for 10 minutes while running on high heat.It measured 100 to 109F across its surface at the end of that time, and returned to 130F in 2 minutes.


Using a Fluke Ti32 thermal imager (E=.96) I could watch the device heat quickly, reaching maximum temperature in a minute or two. Both top and bottom of the device are heated. The sides and ends are not.During this testing the device was placed on ceramic felt insulation to minimize heat loss to the desktop.



Using a USB test meter and an adjustable constant current load I found the ZLS-A8 could output 2A as shown in the specifications. This photo shows my test setup running at 1.5A in an initial test.2A load testing showed the same results. My tests show QC or PD charging are not supported.



The device can recharge its internal battery at nearly 2A. Using the Jomst supplied cable and the charger for a Samsung S5 I recorded the start of charge. For this test the power bank was at 1/3 discharged.



Even more interesting was the discovery that the ZLS-A8 could heat on high and charge another device at the same time. I expected to see either one or the other but not both. My S9 phone charged the same with the heat on as with the heat off.


To fully discharge the device before testing capacity, I ran the heat and a 1.5A USB load for an extended period with no problems. Charging at 1.5A the ZLS-A8 took 5:13:55 to fully charge. The charging stopped when full, showing capacity as 6892 mAh. While less than the specified 7800 mAh it should charge the battery in an S9 phone about twice (allowing for common efficiency losses). It is possible that the device's safety circuit limits discharge or charge aggressively. I could not disassemble the unit to test the battery directly.



My tests show that the Jomst ZLS-A8 works well as both a hand warmer and as a power bank, even both at the same time. The battery capacity is enough to keep a cell phone running for days.I was pleasantly surprised that an inexpensive device could fill both roles.


Code: AOSPBUKR

Amazon link: https://www.amazon.com/Jomst-mAh%EF%BC%8CRechargeable-Capacity-Bank%EF%BC%8CBest-Christmas%EF%BC%8CWinter/dp/B07Z25G6B2/ref=sr_1_4?dchild=1&keywords=hand+warmer&sr=8-4



Product Review - Hand Warmers

2019-12-26 00:00:32share:


Today, we're sharing product reviews about the 7800mAh Rechargeable Hand Warmer.



product-vipon:start
product-vipon:end

Discount: 30% code +10% Amazon coupon

Discounted Price: $17.99


This review covers the Jomst ZLS-A8 hand warmer/power bank I received through Vipon, shipped from Amazon. I own and regularly use many different power banks, but never one that is also a hand warmer.Would this be a power bank worth using, or just a gimmick and fail in my testing?


The box contains the hand warmer, a USB A to micro USB cable, a storage bag, instructions, and a thank-you card.



The warmer is a combination of white plastic and black rubber. The rounded edges make it comfortable to hold.Its size is a good fit to be held warming both hands of an adult. A little large for pants pockets, it works well in the front pocket of a hoodie or in a jacket pocket. I recruited a teenage helper for some hand photos:



Specifications:


Battery:7800 mAh

Charge:2A 5V

Discharge:2A 5V

Heat:95 to 130F in three levels, with a working time of 6 to 12 hours in a 68F test room.



There are three ports on the device, two inputs for charging the warmer and one output for powering other devices. The provided cable works for both charging and discharging.With a USB C input, the cable used for newer phones works with the device for charging and discharging. Needing only a single cable is a handy feature.


The single button controls heat and power bank functions. Double tap the button to turn on the USB output. The three indicator LEDs glow blue to show the power level.Hold the button >3 seconds for heating.Tapping the button moves through the Low – Medium – High heat ranges. The LEDs glow red to show the heat level. When the internal battery is completely discharged, the LEDs blink red/blue and the output and heat shut off.



When it arrived (cold from being on a delivery truck in winter) I immediately opened the box and activated heating mode. I expected to feel some slow warming, but I was wrong.The warmer heated quickly, reaching high heat that was almost, but not quite, too warm to hold. Holding it tightly in my hands I could tell the temperature dropped a little but this brought it to a comfortable holding temperature. Knowing it was not a gimmick but was a real handwarmer, I moved on to real testing.


Using a Fluke 59 Max+ IR thermometer (E=.96) in a 68F room, I measured the warmer's temperature in a few different scenarios:


  • Low level = 99 to 100F
  • Medium level = 107 to 111F
  • High level = 120 to 129F


Watching the temperature over a few minutes I could see it cycle slightly but only by a few degrees. I next placed the unit in the freezer for 10 minutes while running on high heat.It measured 100 to 109F across its surface at the end of that time, and returned to 130F in 2 minutes.


Using a Fluke Ti32 thermal imager (E=.96) I could watch the device heat quickly, reaching maximum temperature in a minute or two. Both top and bottom of the device are heated. The sides and ends are not.During this testing the device was placed on ceramic felt insulation to minimize heat loss to the desktop.



Using a USB test meter and an adjustable constant current load I found the ZLS-A8 could output 2A as shown in the specifications. This photo shows my test setup running at 1.5A in an initial test.2A load testing showed the same results. My tests show QC or PD charging are not supported.



The device can recharge its internal battery at nearly 2A. Using the Jomst supplied cable and the charger for a Samsung S5 I recorded the start of charge. For this test the power bank was at 1/3 discharged.



Even more interesting was the discovery that the ZLS-A8 could heat on high and charge another device at the same time. I expected to see either one or the other but not both. My S9 phone charged the same with the heat on as with the heat off.


To fully discharge the device before testing capacity, I ran the heat and a 1.5A USB load for an extended period with no problems. Charging at 1.5A the ZLS-A8 took 5:13:55 to fully charge. The charging stopped when full, showing capacity as 6892 mAh. While less than the specified 7800 mAh it should charge the battery in an S9 phone about twice (allowing for common efficiency losses). It is possible that the device's safety circuit limits discharge or charge aggressively. I could not disassemble the unit to test the battery directly.



My tests show that the Jomst ZLS-A8 works well as both a hand warmer and as a power bank, even both at the same time. The battery capacity is enough to keep a cell phone running for days.I was pleasantly surprised that an inexpensive device could fill both roles.


Code: AOSPBUKR

Amazon link: https://www.amazon.com/Jomst-mAh%EF%BC%8CRechargeable-Capacity-Bank%EF%BC%8CBest-Christmas%EF%BC%8CWinter/dp/B07Z25G6B2/ref=sr_1_4?dchild=1&keywords=hand+warmer&sr=8-4



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