How do I determine if my battery is bad or my solar panel is bad

[Clearymj]

I have one Arlo Pro 2 camera with a solar panel that i recently attached to it.  Prior to attaching the solar panel I rarely had to charge it.  Now that the panel is attached and 'working' the battery does not last long at all, usually dies within a week or two.  All devices are less than a year old.  How do i determine if the battery is bad or solar panel is bad?

[TomMac]

 just disconnect the solar panel and then fully charge battery... replace battery and see if the battery goes back to normal life usage

[Clearymj]

duh....Great point.  Thanks!