Model LFX09L2-BS12 - replaces the YB4L, YTX4L, YTX5L, YTX7L, YTZ5S, YTZ6S, YTZ7S and equivalents. Shorai - The World's Lightest Strongest Powersports Batteries. Lithium Iron battery. Ultra lightweight design, around 75% lighter than a lead acid equivalent.