Blade chroma batteries. England UK.

Hi.
To check batteries you need an internal resistance tester like this:
https://banggood.app.link/4FHl6GpPBcb
Some chargers have this option too, like skyrc Q200.
Regarding new batteries, I suggest you to buy Cameron Sino brand, i got two of them and I can fly my chroma for 20 minutes each.
You can find them here:
https://www.batteryupgrade.it/shopBrowser.php?shopGroupId=58944094
Don't buy Gifi Power batteries, they have very bad quality and puffs after few recharge cycles.
This from my experience.

 

Everything depends how you left the batteries while non in use.
They should be kept in "storage" (3,8 volts/cell) and recharged every 3 months also if not used, then put back in storage.
If you leave batteries fully charged or leave them discharging for long time they will be damaged and no way to recovery.
If batteries comes with the new drone, they could be old.
Don't fly with these batteries, replace.
(Sorry if my English is not perfect, I'm Italian...)

 

I recently got one from uk ebay and a little later 1 from uk amazon for around £68. The price appears to vary a lot.