I bought this battery hoping it would bring some convenience for on the go power for my 12v breast pump (Spectra S2). I affixed it to the bottom with velcro. I am blown away! I initially charged it for about 8 hours and have been using it ever since without recharging. I have pumped 10 times for 25 to 30 minutes each session and the pack still has 4 out of 5 lights on! I am very confident that I can get several days out of the battery between recharging.Edit: This battery lasted for 20 pumps on one charge before giving up! I am so impressed!
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