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.

Seemed like a perfect solution to power my Spark 40. Alas, it did not last even a year before it just stopped power any of the output ports. When I first got it, it worked great at power the Positive Grid Spark 40. It worked for several sessions, I then did not try to use until the other day. I acted like the battery was drained. I plugged it into the charger that came with it. The charger lite up, but it was green, which by the little manual, means it is fully charged. I then tried it again, no go. Tested all the output ports, nothing.Sent a email to service department at the company, though I am not counting on them to respond. A waste of 70 dollars.

Bought it for my Spark 40 amp. The longest I’ve ever used it was about 4 hours and it’s never even come close to running down.

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.

Charges well