I use this to run a cooling fan on my telescope and I can get several nights of continuous usage before I need to recharge it. The EXTREMELY BRIGHT blue LED is not good for astronomy but I bought some automotive tail light repair tape and put it over the LED and it suits my needs. The charging is a little confusing because the switch has to be turned to the ON position for it to charge. The way to tell if it is fully charged is by looking at the LED on the charging adapter not the LED on the Battery pack.
This thing really impressed me. I bought this so that we would have access to 12V power for a few small things with a newborn. One of those things is a bottle warmer that takes 30 minutes on a 12volt car charger type plug in the car. It was able to not only power the bottle warmer, but it made the bottle warmer more efficient than in the car. We found that it often heated the bottle in around 25 minutes. It could perform two of these before needing a recharge. For its size, i found that to be fairly impressive. The items dimensions are about 5.7"X 3.4" X 1" thick. It's a little too big for a gentleman's pocket on average I would say, but OK size for a purse or bag. Keep in mind it is a battery, thus it is a big bulky feeling.
Powers my IEQ30 Pro telescope mount quite well. It is lightweight - so much so that I have gone out twice without it because it I don't notice the weight difference. I've only used it for about 4 to 5 hours for the longest period before charging and I think I probably could have used it for longer. The only way I would improve this would be to able to charge it without remembering to turn it on before charging. It would also be nice to be able to have a second jack to power other times. These aren't faults with the battery. It works much better than I expected and I am quite happy with this purchase. If you are powering at telescope mount and do not want to lug around a glorified 20-lbs. car battery, get this. If you are looking to bulk up on muscle for the summer bathing suit season, by all means continue using 12V car batteries to power your scope. This will not help you build muscle. I am not sure how fast it gets to full charge from full discharge as I have not run out of power in over 20 observing sessions, but I am usually ready to go in couple hours from one session to the next.
They worked well, and held the charge pretty well. They were also well built, except for some of them, which had a more fragile power adapter connector pin. Some of the connector pins ended up being pushed inward or pulled outward, but I was able to open their cases and put the pins back in place.The chargers that they came with also worked well, and I had no issue with these. The only other issue with the batteries is that they had no charge indicator, so I had to leave them charging for a few hours to make sure that they were fully charged. But other than that they worked perfectly.
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