Forum Discussion

pauldub's avatar
pauldub
Explorer
May 05, 2018

Trojan T-105 versus T-1275

I'm considering using a pair of T-1275 instead of T-105 to gain some additional amp-hour capacity. Should I expect either of these choices to last for about the same number of 50% discharge/charge cycles? Also, it seems that a pair the 12v in parallel with likely have half internal resistance than a pair of 6v in series. I'm guessing the pair of 12v would do better running an inverter with a 1000 watt load.

20 Replies

  • Scrubber batteries are designed for scrubbers and must compromise in some areas.

    They will last roughly 70% of the cycles versus a T-105

    They are built to pay homage to reserve capacity duty and not CCA nor the 20 amp hour rate. Medium rate discharge for a couple of hours. These batteries bow and pay homage to Peukert design concept. Narrow performance range because they have to be sized to squeeze into a scrubber.

    They are acid starved. They sit on a charger after supermarket floors are scrubbed. from, say 4:00 AM to the following midnight so charging agility is not important.
  • Niner, was not your t-1275 used and abused before you got it?

    Perhaps a t-1275 recharged properly from new, would not require the extra voltage and duration at that extra voltage.

    I was going to get a t-1275, but then my Northstar AGM -27 proved it alone could meet my needs, and next month will have been flying solo for 3 years.
  • T-1275's are not the best choice for ease of maintenance, top charging, or equalize recharging. They require quite a bit more voltage, time and work to equalize recharge to a full 16.0V to desulfate.

    Ask Mexicowanderer more about the details on these floor sweeper, scrubber, and sometimes golf cart batteries.

    Unless you understand the limitations of these batteries, and are willing to go the distance to really get them fully recharged, GC-2's are a much better value, and much easier to top charge, maintenance recharge, and desulfate, due to the physical volume, plates, and electrolyte volume to lead plates dimensions.
  • RoyB's avatar
    RoyB
    Explorer II
    I always wanted to get the T-1275s mainly because they were 12V batteries but could never find any I could afford... Finally went down last week and picked up four Duracell 6V GC2s from local Battery Plus Store...

    They look pretty neat setting in the back of truck bed with a blanket covering them up. I'm about to get serious now getting my 430AH battery bank going again... They were also marked down 15 percent so final cost for batteries was $89.75 each including sales tax for the 215AH 6V batteries. These were the SLIGC110 model batteries... weight 60.5LBS

    These have the three fluid caps on a rail where you can twist open all three caps at same time to inspect for fluid levels... Neat...

    Roy Ken
  • Smitty77 wrote:
    It's always about space, desired total AH's, need for faster recharge - or not, and of course - budget!

    A pair of T1275s will cost a LOT more than a pair of T105s ! Availability maybe an issue unless you have a big golf cart distributor nearby.
  • Ok it is happening again! It says there are 3 replies, last at 3:47, but it is not showing on my thread. I suppose this will count as #4 and like before many times, I will never learn what #3 ever was.

    Does anybody see #3 from 3:47? If so, who is it from? I want to be able to tell Forum Support enough info that they can fix this. Thanks!
  • If Winnie’s battery tray on the TT tongue would have been just an inch wider, I would have installed T1275s instead of two T125s. More amp hours is always better.
  • I also will recommend T-1275's for some people, based upon space constraints. Besides BFL13's positive opinion of the T-1275's - I have a buddy with a Grand Banks that have a bank of these as his house batteries, (With watering system on, makes maintenance pretty dang easy!).

    One thing I'm not clear on, is how long have they been available? I don't recall reading about these too far back? Is it a newer Trojan Deep Cycle offering?

    It's always about space, desired total AH's, need for faster recharge - or not, and of course - budget!

    Best to all,
    Smitty
  • You get 300AH with a pair of T-1275s. They gas nicely when recharging similar to the way 6s do, and unlike the hard to recharge marine/rv 12s. The T-1275s are great with inverter high amp draws for less voltage drop than Wet 6s. A pair of 105s is 225AH, so 300 will be less resistance just from that.

    I had a post here about my old T-1275s if I can find it. No luck.

    I got two used ones from a golf car place that were two years old at 85% according to their way of measuring things. I equalized them and nursed them back to 90% by load test at the 20hr rate for 10 hrs to 50% and used them fairly hard in the RV for five years. They finally got too low in capacity last winter, so they did really well. They held in the high 80s to near the end, then sort of died down fairly quickly.

    Two new ones looked after from the start would be awesome. I now have an AGM 6GFM250, (8D format-148lbs) which acts something like the pair of T-1275s,( 82 x2 = 164lbs) so that would be another way to go perhaps.