Time to change batteries

sorry I missed this question at me.  I am using twelve 12 volt 200A/H AGM generic batteries I bought directly from china for my primary bank,(48VDC 600 A/H)  I used 5/16" x 1" copper bussbars to tie the batteries in and guarentee absolute same lengths for all interconnects.  These batteries use a 8mm threaded bolt into the battery vice a post. 

My camper used two of the same batteries in a  12VDC 400 A/H RV system.   I bought them via Rakuten here in japan for entirely too much cash (embarrassed to say how badly I got bent over price wise on those first ones.)  After using them for about 5 years I started planning my system for the cabin, the two I originally bought were still kicking and could still put out full capacity though they cost so much that I decided to try and track down the actual Mfr. to see if I could get them cheaper if i imported them myself.  

So I  started looking closely at them and found the Mfr by contacting Chinese companies via ali baba and backtracking who they had sold to in japan. I did not tell them what I was looking for, just who they had sold to so I could contact them,for references on their quality and ability to ship on time (all BS fluff to find who was who in the Zoo)  or to possibly buy locally. (yeah right).  Once I found out who was selling batteries to Rakuten i just ordered directly for about 185 USD per battery shipped to yokohama japan.  They are marketed on ali baba as "TR-200 12 VDC VLRM AGM Batteries", by ******** ******* Industry (name removed to protect our gracious sponsors)  . They weigh in at 145 lbs apiece and to tell the truth, I have no clue as too what they are called in the states IRT size... L8?  L16?  .  I measured the cases and they are an odd size i think, who knows?  I am not that well versed as too what is available there as I have done all my research for what was available here. 

Just remember the guys selling batteries in the states that ARE NOT a Major maker like Rolls Surrete or concorde, Trojan etc. etc. are buying these same generic batteries having their logo put on and selling them for a grip in the states.  You take your pick...and your chances YMMV.  Somebody before me (a large japanese company) researched these guys, and then was buying them and selling them here locally for over 1k a piece I just snooped behind them and bought the same model with the same options minus that companies logo on the side.

as far as charging goes I had the Factory send me their charging specs for max amps for bulk along with the voltage setting for bulk, absorb and float, temp differential etc. and set the charge controller accordingly.  I also EQ them once every three months or so but being AGM's its more like a leveling charge than anything else.