I hear its difficult to reinstall the top case/cover of the battery case. I just went thru this with SAMS Club, who just threw the top of the case away without telling me after they replaced the battery with a battery other than OEM. Whats the big deal with re-insatlling the top of the case? The replcment is an Enegizer 124R and from what I can tell, the height is exactly the same, the terminals are the same width. Etc. Can you tell me what could be the problem?