TalentCell 12V Power Bank, Rechargeable 12V 3000mAh DC Output Lithium ion Battery Pack with Charger for LED Strip/Light/Panel/Amplifier and CCTV Camera, Compatible with Spectra Pump/Telescope

You can add a load, but usually the load needs to be large enough to drain the battery a decent bit. Like just make some LEDs always on until its enough. Or a resistor. The mom value is different for each bank so you kidnof have to test. For one that doesn't turn off it's been a while (Amazon says I got one in 2019) but IIRC this power bank doesn't auto off. https://www.amazon.com/TalentCell-Rechargeable-Amplifier-Multi-led-Indicator/dp/B00MHNQIR2