Review on 🔥 USB-195 Mini High Temperature Hot Glue Gun - Portable and Battery-Powered by Kelsey Brown

I'm sure what I write here will void my warranty, but I bought this glue gun specifically because of the 75 minutes of work promised on the packaging. Long before I did the math and then disassembled the glue gun, I drained its battery several times, and I'll tell you that 75 minutes is pipe dream. My actual experience and subsequent math confirm this. I was very disappointed that in real life I only got 23-28 minutes between each charge. I like portability, don't know why the Revain is asking about weight, but it's heavier than most hot glue guns due to the internal battery, but no heavier than a real gun, so no complaints. I didn't feel like returning it (which I very well could have done) as I couldn't find any other mini guns that last longer and instead I decided to just add a few more batteries in parallel. So I started disassembling the gun. to add a pigtail connector so I can easily plug in another set of batteries if one runs out. In doing so I found that it is powered by a single Li-Ion 18650 battery (as I suspected) with a capacity of 2000mAh or 2Ah. Then I decided I wanted to find out where they got that 75 minutes (1.25 hours) from, so let's check the math. The bottom of the handle indicates that it is a 3.7V, 20W device. Using these numbers I can determine how much it will actually take (how many amp hours) to run this gun for 75 minutes. 20 watts * 1.25 hours = 25 watt hours. To get amp hours from watt hours I divide by voltage (3.7) which is = 6.75 amp hours or 6750 mAh. That's a far cry (almost 3.5x) from the 2000mAh provided by the single 18650 battery in the pen. But it confirmed my experience that it would only run for about 1/3 of the advertised 75 minutes since it was actually running at just under 1/3 of the required amp hours. I went ahead and made an extra pack of 2 extra 2.6Ah LG 18650 batteries in addition to the 2Ah battery that was included. It's a little clunky as there's no convenient place to install extra batteries, but changing the batteries should have been an easy task from the start. With this setup, I get around 85-90 minutes of actual usage on a single charge. Overall the gun works great, although it can take a little longer to warm up than others, but if 75 minutes of runtime between charges is a huge benefit, don't base your purchase on that number.