Hello, So I got the check hybrid system light and the VSC light on, got it to the dealer and they said 1 block was too low so I took out the hybrid battery and check every cell, one was rated at 6.4v and the rest were all 8.02/8.03....I'm trying to find one online to replace the 6.4v one but I could only find the 7.5 volt's on ebay and at local shops, is it ok to put in the 7.5?