Hi guys,
I have a same problem. A few weeks ago I replaced my battery for a new one, which now doesn't get recognized. There's a cross through the battery charge icon and it says "No battery available".
I can use my laptop with the power cord (green light), but obviously you don't buy a laptop to use only with the battery charger. If I take the charger out, it closes down immediately.
I've reset probably everything there is to reset: SMC, PRAM, NVRAM. I took the battery out and in again, but nothing seems to work.
I ordered the battery at an authorized reseller, did everything exactly like in the video.
HELP! :'(