Arlo Pro and Pro 2 Battery and Account Subscription Question

[JoBu-NY]

I've done some searching and I cannot find the answers I'm looking for. 

1. If you run an Arlo Pro or Pro 2 plugged in with an outdoor cable, do you have to have the battery installed as well? or could I just remove the battery and run it on the power cord the entire time? 

2. If you go over the (5) Camera limit for the free subscription, can you just pay $2.99 for the 6th camera? or is it once you go over the 5 camera limit you have to buy the $9.99 subscription for all the cameras. 

[TomMac]

1) the battery can be pulled if on AC power ( in or out ) ( but also won't hurt battery pack if left in )

2) I do believe it's the $10 fiq to the next level of up to 10 cams and 30 day storage ( IIRC indiv cams can use SMART as $ )

BTW only $99 per yr so you save 2 months if annual