VRLA Gel Batteries

VRLA Gel batteries are one of the two broad types of SMF batteries.

VRLA Gel batteries use a composite separator made of a glass mat bonded to a porous polyethylene or polyvinylchloride sheet. The batteries are then filled with a thixotropic gel mixed with sulphuric acid. That is why they are called VRLA Gel batteries. Sometimes, they are also called T Gel batteries.

Advantages of VRLA Gel batteries are:

  • Perform better than VRLA AGM batteries in regular deep discharge (>80% DOD) applications
  • Perform better than VRLA AGM batteries in low power applications

Disadvantages of VRLA Gel batteries are:

  • Higher self-discharge rate compared to VRLA AGM batteries
  • Don’t perform as well as flooded or VRLA AGM batteries in cold temperatures (<40  ̊F)
  • Don’t perform as well as flooded or VRLA AGM batteries when they regularly reach a shallow depth of discharge (<20% DOD)
  • More expensive than flooded and VRLA AGM batteries