Adds background, shares May 10 (Reuters) - Electronic Arts Inc EA.O on Tuesday forecast first-quarter adjusted sales below estimates, bracing for weaker sales of its "Battlefield 2042" title and a slowdown in lockdown-fueled demand. The results come hours after the company said it was ending a lucrative partnership with world soccer governing body FIFA after nearly three decades. The lightning surge in sales fueled by lockdown-weary gamers is starting to fade as normal life resumes, while rising inflation threatens to curb spending power.