Well that's what I always read too. Two of the sets that went bad on me were B&B. One set was suspect from the start because the resting voltages did not match. The second set was provided by a vendor specializing in high power ebikes and they gave me factory fresh, perfectly matched, batteries. That set ran great, until they sat over the winter on the Soneil charger. Everyone tells me Soneil makes THE BEST chargers too. At this point, you can understand my questionable faith in either brand!