Review on Rechargeable 12V 3000MAh Lithium Battery Pack: Power Bank For LED Strip, CCTV Camera & More by Robert Elder

This thing is awesome. I purchased it so that I could use my Spectra S2 pump without being plugged in and I am so glad I did! I have now used my pump for 15-20 minutes at a time, 3 times a day, for 3 days straight now and it's only lost one of the little light dots indicating it still has tons more juice left before it needs charging. I'm SUPER impressed with the battery life and it powers my pump with no issues. I don't notice a difference in strength of the pump using this vs. when it's plugged in to the wall. It's nice that it has the USB port as well so you can use it to charge your phone, kindle, iPad, apple watch, or whatever. I did have to purchase a male to male connector cord in order to use it with my pump. that part is not included- but still! Around $35 worth of parts saved me paying $100+ to upgrade to the S1 pump!