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The BA-400 is the single Li-ion battery pack for the Inogen One G4 portable oxygen concentrator and its OxyGo FIT twin. It is rated 14.54V and 48.2Wh (3350mAh) and uses Grade-A cells, so it keeps the G4 light for carrying through the day. The G4 runs on one battery at a time, so this is the pack you swap in when the installed one runs down; the larger G4 double battery lasts longer but adds weight and bulk. Owners rate it highly for fit and reliability, and the main complaints are about run time shrinking over the years and the cost of replacing packs.
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Lowest price we've seen: $239.99 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
Owners of the G4 and OxyGo FIT rate the BA-400 highly, mostly for correct fit and steady performance. Complaints center on run time that shortens over time and the expense of buying replacements.
The BA-400 is a Li-ion replacement battery for the Inogen One G4 portable oxygen concentrator and the OxyGo FIT. It is a single-battery pack with a rated 14.54V and a capacity of 3350mAh (48.2Wh). It uses Grade-A cells.
The single pack keeps the Inogen G4 under 3 lbs. An integrated battery management system (BMS) protects the battery for stable charging and discharging. It is a replacement battery in 90% new condition.
It replaces part numbers BA-400 and 1400-2010-4. Not every compatible device model is listed. To confirm compatibility, open the device and check the original battery model.