I agree. If you still have some concerns, I'd give Lifeline a call and talk to one of their technical experts. I had an issue with a bank of 6 new lifelines and after talking to one of their engineers, I got a ton of great information on my issue and the problem I had been having as well as getting my problem solved. If you talk to them, ask them how to set up your battery bank mix. Do you put the 2 new in series together, or do you split the bank with a new and old each in their own series. I don't know if it would make a difference, but it's worth the question to an expert.
