On line source for Lifeline batteries?

S Davis wrote:
If I split it into four batteries it would be an additional $250.00 to $300.00 not to mention the cost of the extra wire and connectors to get 500ah. Is it worth the extra cost?

Two 100AH AGMs can run my 2000w inverter to run the microwave for the usual short tasks. Having four would be better for how long you could do that before a battery recharge is necessary, same as with Flooded batts. No advantage whether using 8D, 4D, it is the total AH that count in the bank.

Not clear what you are comparing. I don't know if what I have would suit your camping style etc, but looking here helps with the cost comparisons:

http://www.bestconverter.com/Universal-AGM-Batteries_c_127.html

I have two of the 12100 100AH same as these but a different brand, same factory same specs. "Low end AGMs", perhaps, but works for me! I got my 8D second hand, but they cost a lot new.

If you got four of these 100s it is the same price at $800 as two of the 4Ds for 400AH. So $2/AH The 8D is $475 for 250 so $1.90/AH but you have to get 500AH at $950.

Do you care if you have 400 or 500AH? Is the 4D tougher than an 8D?
Can you hump a 150 lb battery around? I had to get help. Easy with the 27s. Lots to consider, but each person has his own scenario what works best for him.