battery problem cf74

hello,
i have a problem with my CF74,
old battery is dead,
I bought a new original battery, and i install this in my toughbook,

but the battery is charging 1%, but no more,
after a few minutes, the battery indicator light flashes and the battery icon I get "plugged in but not charging"

I tried with computer on, and computer off
the charger is original and in good condition,

it is a special operation to install a new battery

thks