I am using Tapo C420S2 cameras and I want to buy spare batteries so I can swap them over straight away after it goes flat. It'll save me climbing the ladder twice. I'll only have to climb the ladder once to take out flat battery and replace with newly charged battery instead of going up the ladder to take out flat battery and once recharged climb back up the ladder to replace it. 

Also, in case something unforeseen happens and I have to duck out before battery is recharged, my camera can continue to operate.

Tapo A100 battery pack. I;ve tried looking online but haven't been successful yet as to finding them to buy. I realise it may be a new product but thought I'd post my query here.

Cheers :)