The above pictured TalentCell YB1206000 battery is rated for 12 volts at 6000 mah. It uses three paralleled paired of 18650 batteries wired in series. The DC coaxial jack is limited to 3 amps of current drain. That is more than enough to power almost any modern day QRP radio like the Icom IC705 and the Elecraft KX series radios. The power jack is 5.5 mm x 2.1 mm. The battery also comes with a charger as well as a set of cables that has two male and one female coaxial connector. I like the idea that this battery has an on/off switch. The battery's dimensions are: 5.7" x 3.35" x 1.1"
At the time I posted this, the battery sold for $34 off of Amazon. You can get this same battery, minus the USB jack for $31.99 off of Amazon.
At 5 watts out of my Elecraft KX3, the current drain on the battery is less than 1-1/2 amps. With the use of the 6000 mah TalentCell battery I should be able to operate an entire day when setting up for a parks on the air activation.
If you want an even larger capacity battery, TalentCell makes an 11000 mah battery. You can draw up to 6 amps of current off this model. At the time of this posting, this battery sold for $62.
If you operate at a power level of less than 5 watts, or maybe operate short term whereas you use a very low current consumption, maybe the TalentCell YB1203000 would fill your needs. This battery pack is smaller in size than either of the above two batteries and is limited to only 3000 mah. This battery sells for $24 and has a USB port.
All of the above batteries have 5 LED indicators to show the capacity level. All five LED's will light when the battery is fully charged. You can charge the battery off of the supplied 115 volt wall wart or charge the battery from your car's power outlet with the optional car charger purchased from TalentCell.
I like the idea of these batteries including a USB power outlet. I always use my cell as a hotspot when setting up portable so the cell phone is always on. From time to time I may use my AT-10 auto tuner. The ATU has its own internal battery, but if I get in the field and possibly forgot to charge the ATU's battery, I can use a USB cable and charge the ATU's battery from the TalentCell. For those that use the Mat-tuner ATU, it can be also charged the same way, via USB cable. The NanoVNA as well as the TinySA (Ultra) can also be charged via the USB port.
For many years, when I operated portable, I would used RC vehicle LiPo batteries to power my radios. I would cut off the connector that was attached to the battery and add Anderson Power Poles. They worked just fine. The TalentCell battery pack is a much cleaner package and I like the idea that they have an on/off switch and a USB port.
TalentCell web site