Battery experts opinions please.

Chris 195 7/8 B&C

cart is a 36v series cart. In 2010 I upgraded to a alltrax 500 amp controller and everything else. I put new trojan t105 batteries in it and screwed up by not using welding wire for my cables and as a result I melted a post on a battery. Lucky to have only fried a battery post, lesson learned and corrected.
My batteries are stamped either A or B 0. The distributer I got the battery from was going to send it to trojan and have a new post installed for me and gave me a battery stamped can't remember exact month but was 2007 as a loaner until mine was repaired. Due to distance, being busy, and lazy I never went back for the repaired battery and just been riding with the one he gave me.
So on to my situation now. The 2007 battery appears to be failing. 6.1 volts 12 hours after charge and I get a hydrometer reading of 1130, 1155, and 1210 on the three cells. The rest of the cells in the other batteries are around 1250 and 6.3 volts.
A local battery dist. has a crown battery cr235 that is two years old and he said it tested good that I could pick up for $65.00. My pricing on new crown cr235 or trojan t105's would be about $104.00 each.
My thought is this would probably last until the rest of the pack would require replacing. Does it make more sense to A) go with the one used battery, B) go with one new battery, or C) go ahead and bit the bullet and replace all 6 batteries.
Also what do you guys prefer Trojan or Crown?
Sorry so long and thanks for your input.

BGW

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scottyb

Assuming T105 and CR225, they are well matched. The crown has 2 more pounds of lead in it and usually costs a few bucks less but that can vary depending on your location.
I would go with the used battery at this point.