Talentcell Lithium ion Battery Pack NB7102, Rechargeable 17500mAh 64.75Wh Li-ion Power Bank with DC 24/19/5V and USB-C 5/9/12/15/20V Output for Laptop, Notebook, Smartphone, Camera and More

I needed something to extend the battery life of my projector in a spot that has no access to power. Nice to find one in an unusual voltage like this in a nice well though out package.

I used this battery to power my Spark 40 guitar amp, but it has quit taking a charge. Great while it lasted, but I expected a long life! I held off posting a review hoping it would come back to life, but no luck.Update: The manufacturer is sending me a replacement - I couldn't ask for better service. I'm changing my rating to 5 stars. Good company!

I use the product for my Spark amp. It does what it needs to do and lasts for days. For reference, i use the amp for about 30-45 minutes each day. I don't need to recharge for about a week. Even when I do need to recharge, I only need to recharge it for a short amount of time before it's back at full charge.

I purchased this pack to allow portability of my Positive Grid Spark guitar amplifier. The first pack I received either had defective cell(s) or a defective charge/analyze circuit. All led’s of the 4 step led charge indicator would illuminate when the pack was charging, but only 2 or 3 would illuminate when the charger was disconnected from the pack, even after 5 days of charging. Amazon did send out a replacement pack immediately. The new pack displayed a 75% charge upon arrival, I was worried, but after a few hours of charge time all 4 led’s illuminated as expected. I haven’t used the Spark for more than 2 or 3 hours at a time but so far the battery pack has worked great and the portability aspect is great. I’ll update the 3 star rating in a few months after more testing and use. I’m always leery of “unusually named” crappy Chinese lithium battery products and their very optimistic rated vs. actual capacity. LolBy the way, the magnetic phone mounts work great and far better than I expected as an option for mounting the battery.One year later…Replacement pack does not fully charge and dies after adding only 20% charge to my iPhone 14 Pro Max.I maybe have 15-20 hours of use with the Spark amp. Really disappointed. I’ll take it apart eventually and replace the cells.Update….Who cares……This pack, yep #2, is an absolute POS. I’ve made multiple attempts to reach the seller!!!😂😂😂😂Who am I kidding. Great idea, but super crappy execution. I look forward to a proper, tear down and analysis! Ordinarily wouldn’t take the time but I’m almost irritated enough to add it to the list of projects!

An amazingly versatile and powerful product thanks to the wide range of adapter plugs that come with the unit. I been able to recharge my phone, tablet and laptop but best of all... this product can also power my 40 watt guitar amp for almost 4 hours. Outstanding performance!

I recently purchased a Spark 40 guitar amplifier. Browsing the internet I found many people are using the NB7102 battery to power the amplifier instead of using the A/C power adapter.I purchased an NB7102 battery from Amazon. When I tried to charge it, it didn't seem to be charging. I returned the battery to Amazon and they in turn sent me a new battery. This one appears to be working much better. The amplifier works great with the NB7102 battery. I have not used it enough to tell for sure, but other people report the battery lasting 4-6 hours on a charge while using the Spark amplifier.The people at Talentcell reached out to me to make sure my return was being handled properly. They also gave me tips on charging, and using the battery indicator button. I am very please with their response, and will make future purchases from the company.

overall great product I even purchased a second battery because it works well and holds a long charge. the only downfall I have found and reason for 4 out of 5 stars is because it will not charge my Laptop ACER Zenbook Pro 15 OLED. The adaptor that will fit it is actually the HP adaptor however it glitches and doesn't have a secure adaption causing it to not work 98% of the time. Great product except the adaptors. Both batteries and adaptors have the same problem.

I bought this battery for one reason. The reason? To provide power for the Positive Grid Spark Amp! I saw a video on YouTube that demonstrated this battery being used for that purpose.I charged the battery overnight, plugged it into the amp with the supplied cord and turned it on. Worked just like that. Combined with the Xvive U2 wireless transmitter for the guitar, the Spark Amp is even more versatile. A person could take his or her guitar and amp outdoors to play, to a campfire, anywhere without worrying about whether or not there is a power outlet to plug into.I do not know how long the battery will power the amp. The video I saw estimated over six hours. I have not verified that personally.I am very happy with the purchase of this battery and, at this point, recommend it to anyone who wants to use it in the same way that I do.Only time will tell about the longevity of the battery.