
I've had this for several weeks now and it works perfectly for the Spectra S2 to allow you to move freely with the pump. I charge it once a day but I'm sure you could go days without charging if needed. I'm also not sure why other reviews say you need a separate connector - just plug the other end of the included cord in (see attached picture).

5-Pack EBL 9V Rechargeable Lithium Ion Batteries With 600MAh Capacity And 5-Bay Charger For Smoke Alarm Detectors - 2A Input
34 Review

EBL Rechargeable AA Batteries 2300mAh - Long Lasting Battery (8 Counts) + Charger for AA AAA Batteries
47 Review

🔋 EBL Battery Charger Combo: Rechargeable AA Battery 2800mAh (4pcs) and AAA Battery 1100mAh (4pcs) + Charger for AA/AAA/C/D NiMH Batteries
39 Review

Fireproof Battery Organizer Storage Case: Waterproof & Explosionproof Safe Bag Fits 210+ Batteries - With Tester BT-168, Carrying Container Bag For AA AAA C D 9V Lithium 3V Holders
49 Review