Talentcell 12V Lithium ion Battery Pack, 11.1V/9000mAh 99.9Wh Portable Power Bank, DC 12/9V and 5V USB Multiple Output for LED Light Strip, CCTV Camera, Heated Jacket, Mobile, Spectra Pump, and More

I needed a power source that is compact and portable for my CPC 11 telescope and this was what I needed. It is so small and light I was able to attach it to my fork handle. I connected it to my telescope by a 3 foot power cord. No more cord wrap for me. I used it to track an imaginary object in the sky to test it. The battery lasted close to 8 hours. I am very pleased with this battery, had no power issues with my telescope.

Keep dry, moisture will brick it.

This thing works well and had a good price when I bought it. Battery capacity seems very good, too. I like that it has 5 volts output on the USB port, and then two barrel jacks with 9 and 12 volt DC outputs and lots of included cables. It's really convenient for powering tons of things, and it's nice as a backup for charging the cell phone for days during power outages. It can also power almost any telescope and telescope accessories out there for several hours depending on your setup. The only thing that's a bit odd is to charge it, you have to turn it off and plug into the 12v output port, which I guess becomes a charging port when you turn if off. I don't know how it responds to things that are incorrectly wired, or if you tried to charge it without turning it off first. When using less expensive and less known branded products like this, I think it's important not to assume anything and read the instructions carefully. Sometimes, online shopping sites that sell lots of these cheap, imported products like this often do not ensure that the products they sell conform to the same standards and regulations we're used to in the US, so it's up to you to determine if a product is safe and has all the necessary certifications, etc. All in all, I like this product and would likely buy it again assuming the price stays comparatively low.

I had owned this company's older, smaller version from a couple years ago and couldn't find it come this winter. I ordered this one because the last was great and for the added time of use provided by the larger bank. The older one fit in my M12 chest pocket nicely with an extra power cord that I ran inside the jacket and you never noticed it being there. This one though, is a brick; much larger, much heavier, which I knew going into it but it's just as uncomfortable to have in the back pocket as the larger M12 batteries. The BEST PART is that I found my old one (unused since last winter) still holding a full charge and ready to go! I will put this one on the usb port in my backpack and use it with my jacket when I know I'll be in the cold for a lengthy time. If their battery packs are good enough to hold a charge for about a year without use or charging, there's no way I'm giving this one up. I'll find a use for it!

This power supply is well made and the LED lights indicate the state of charge. I am using it to power up a telescope that has a computerized drive system.

This battery is great for taking anywhere to charge almost anything you cannot charge everything on there of course but there is a lot of things that you can charge. It takes about four hours or so to charge up but once it’s charged up, it’s ready to be transported when you leave house or wherever you’re going or even if you’re in the house and Your phone dies or something else! I don’t think I have any complaints. I have another battery the same kind and I thought it was going dead and found out that it was something wrong with the charger did not realize that until I got the new battery with the charger. And then the old one charged up all the way instead of just halfway so now I have two batteries! Lol.😅💖

I used this without problem for a few years until one day I accidentally plugged in a center-ground instead of a center-positive 12V power adapter. The power pack blew up. I would have appreciated if the designers had spent 10 cents on a Schottky diode to protect against reverse polarity power. For this, I am docking it one star.Other than that, it was a decent product; impressed with the battery life. I found it particularly useful that it had both 12V and 5V USB outputs and typically used both at the same time.

Was going to buy a linear power supply for my DAC and thought i would buy a 12v battery bank and give that a try first. I'm glad i did because it was less money and has been working perfectly now for a few months now. The improvement it made on the sound quality was very noticeable (in a good way). I havent calculated how long the battery lasts but ive forgotten to turn it off and have come back several hours later and it was still on. DAC being used is a Mytek Liberty DAC just for reference.