Trojan T105 and T105 Plus are identical inside
I just spoke to Trojan tech support. The Maroon (we call them Red) T 105 and the T 105 PLUS are identical inside. The only difference is that the PLUS has a different top. NO DIFFERENCE in performance between the T 105 and T 105 Plus. So if the T 105 is cheaper,buy that over the PLUS.
I just received this from Trojan tech support:
Standard and PLUS battery have the same performance ratings (same construction), difference is the "PLUS" cover with built-In electrolyte level indicator and Sure-vent flip top vent caps.
How are Plus Series batteries different?
Plus Series batteries use a different top cover than our other batteries. This means the batteries have hinged vent caps and the vent wells are laid-out differently than our other batteries. The Plus Series batteries also have a built-in electrolyte-level indicator, so our HydroLink watering system was not intended for use on the Plus Series batteries and it is not compatible with them.
James (Melvin) Cobb
Technical Support Engineer
Trojan Battery Company
Tel: (678) 518-7318
jcobb@trojanbattery.com