Review on TalentCell 12V Lithium-Ion Battery Pack For LED Strips, CCTV Cameras & More – Rechargeable With Multi-LED Indicator by Chris Fisher

This works exactly as expected. I purchased to make my Spectra S2 portable (insurance wanted me to pay extra $70 for S1)I added a bit of heavy duty velcro to it and stuck it to the pump. I'm so excited about this! Now I'm not tied to chair while pumping!Because I just bought I cant attest to battery life or over all longevity but other reviews say battery lasts a while. Sounds even better than S1 battery life (3hrs)!So for less than the S1 upgrade I have my own upgraded, now portable pump! Wahoo!Note: I also bought a 1 foot male-to-male cable just for simplicity sake.Update: battery life is CRAZY long! I pumped day and night and probably only needed to charge it like 1, maybeeee 2x week. I would just charge it during the hours I wasn't pumping so it was never even an inconvenience.I did notice a pump power decrease when the battery life got down to 2 dots.