I wonder if this works as an UPS…
All-in-one USB Oscilloscope, Signal Generator, Power Supply, Logic Analyzer and Multimeter USD $29.00
- https://espotek.com/labrador/
- https://hackaday.com/2019/06/05/you-dont-need-that-bulky-crt-oscilloscope-anymore/
Mid-Year Sale , all orders place on our RFsupplier web store can enjoy 5% special discount.
Coupon Code: RF28289
Valid date: Till July 31, 2019
US $14.59 - free shipping
mini UPS 
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don’t forget… Ali Express sale start in a few hours !
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Be aware: with a length of 40 cm it will not be 6dBi! the 5,9 dBi I tested was 80 cm long
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1200 mAh 14500 (AA) LiFePO4?
My guess is that around 600 mAh will be more realistic.
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my guess too 800 
but good price