Very satisfied with new concentrator.
Rhythm Healthcare P2 Portable Oxygen Concentrator Battery
Great product, price, and service!
Actually, the battery is very easy to install after it is removed from the ill-fitting canvas carrier that it comes in. The unit has to be entirely removed to install the battery that takes one click and sliding the battery out and easily sliding the fully charged battery in until it clicks and you are ready to breathe again except for putting the unit back in it's case.
Happy with service and product