Terrific device, works great

This is my first portable inflator and it is good. But the drawback is that i sent one back as defective and got another one due to it not working properly. I figured out what the issue is with this product, possibly an old battery as the manual is(dated to Aug 2009). Since I reordered same product since I really do like it and it is handy. I filled a tire with 10psi and I turned it off and then realized my other tire needed air, went to hook up to fill and ERR was on LCD and it gets locked in KPA units. This was the reason I returned the previous one so I was less than happy. I went upstairs charged for about 15-20minutes and it was fully charged on the AC power showing green (mind you I already fully charged roughly from 3am-9am the same day and used at 10:30am. Then I tested on a tire I have in my apartment, and it was working flawlessly (but this time I never shut it off as I did previously, just unplugged and replugged latch), kept testing continuously and got 62psi before low battery warning (keep it mind did 10psi previously so 72psi in reality), and filled up to roughly total 85psi before battery didn't allow me to inflate anymore (and it had an indication of 0 bars on LCD). However, I waited around 10minutes before trying it out again, got it off standby mode, and got another 13psi. Again then battery wouldn't allow me to inflate anymore due to low battery, waited 5min got it off standby and then I got another 4psi.Did the same thing again,got 2.5psi. Total 104.5psi/(114.5psi), which it probably will die soon since seems to allow less and less. So the battery indication on the LCD,the battery low beep, the idea you cant inflate anymore due to low battery unless you wait, something is not accurate with how much battery is actually left.(this is why I mention finicky battery possibly below).

Due to all this my assumption is that there is a glitch, or battery is finicky due to Aug 2009 date, or that it doesn't hold a charge well,(so you wouldn't be able to charge and leave it stored in the trunk of your car for an extended period). This is why I gave it a 4/5. I will try to buy another battery in the future to test my theory. The backup option however is that you could always use your cars 12v socket which is a nice touch to the product as well that you have two options for power. The product is simple to use after you read the manual, it will be second nature to use (I'm unsure why people find it difficult). Also, air does come out when you release the latch so as previous reviewers said, rule of thumb add an extra 1psi on fill up which is no big deal. Overall the product is great, fills up fast about 1psi a second or with higher psi jobs I filled from 19psi to 41.5 in about 2.5 minutes tops. Besides the weird functioning that I experienced with battery/software, I do highly recommend this product.

*update after this day of testing and it working fine. one week later, issue with defective one I returned occurred again. Now the problem shows up ERR, but it is fully charged, and I have to switch power switch on and off repeatedly for it to not get locked showing 888 instead of showing 0 when you turn it on. I really want to like this product, but the defective rate seems to be high. I will be trying one last time to get another one in hope I am lucky like another amazon reviewer and finally get one that works.

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