Battery life is one of the first things buyers ask about when choosing an inverter battery. Okaya's Super Jumbo Tubular (SJT) and Tall Tubular (TT) batteries are two key formats within its XBD+ tubular inverter battery range. SJT models cover 110Ah to 160Ah, while TT models cover 160Ah to 310Ah. The broader range also includes a 90Ah JXT model. This guide explains how each design is built, which features support long life, and what actually affects how long a battery lasts.
What are SJT and TT inverter batteries?
SJT (Super Jumbo Tubular) is the lower, more compact design and covers 110Ah to 160Ah. TT (Tall Tubular) is the taller design and covers 160Ah to 310Ah. Both use tubular plates, XBD+ for longer backup and Certified Backup Hours (CBH) for tested runtime. SJT models carry total warranties of 48 to 60 months, while TT models range from 48 to 66 months, depending on the model.
How do SJT and TT designs support long battery life?
Battery life depends on build quality as well as care, and Okaya lists these construction features across the SJT and TT range:
- Tubular plate construction, which is generally designed for the deep, repeated discharge cycles of inverter use.
- XBD+ (Xtra Backup Design Plus), which Okaya states gives up to 15 to 20% longer backup than a conventional tubular inverter battery of the same Ah capacity.
- Low-antimony alloy, which reduces water loss and maintenance.
- A rugged body with corner protection and securely fitted terminal protectors, for safer handling and installation.
Design alone does not set the lifespan. Okaya's category FAQ gives a typical service life of 4 to 6 years with proper care, and usage, maintenance and heat all affect where a battery lands in that range.
For a full look at what shortens or extends inverter battery life, including care tips, read the dedicated lifespan guide.
How does low maintenance help an inverter battery last longer?
Low water levels expose the plates and are a common reason batteries age early. Okaya's design makes topping up simple and checking easy:
- Six ceramic water-level indicators let you check levels without opening the cell (AEMS, Advanced Electrolyte Management System).
- SJT batteries have all water inlets on one side in a 6x1 layout.
- TT batteries use a vent-plug and float design for spill-free topping.
- Okaya states that most models need only 1 to 2 top-ups a year. Use distilled or demineralised water only.
Does faster recharge make a battery last longer?
Not by itself. Faster recharge means the battery is ready for the next power cut sooner. Okaya states that SJT batteries recharge about 15% faster than conventional Jumbo Tubular batteries, which is a convenience benefit during frequent outages.
Lifespan depends more on how deeply the battery is discharged, how well it is maintained, whether the inverter charges it correctly and how warm it runs. This claim applies to SJT, and it is not a stated figure for TT batteries.
What is the size of an SJT or TT battery in inches?
Container size matters if you have a fixed shelf or trolley. Dimensions from Okaya's specifications are below (tolerance +/- 2 mm).
|
Design |
Capacities |
L x W x H (mm) |
Approx. L x W x H (inches) |
|
SJT |
110Ah to 160Ah |
540 x 210 x 317 |
21.3 x 8.3 x 12.5 |
|
TT |
160Ah to 260Ah |
508 x 198 x 404 |
20.0 x 7.8 x 15.9 |
|
TT |
310Ah |
510 x 215 x 413 |
20.1 x 8.5 x 16.3 |
To compare capacities and check the inverter battery size in inches for each model, use Okaya's inverter battery listing.
What do Certified Backup Hours tell you?
CBH are backup times Okaya declares at set loads. They are tested under the UMHD (Urban Metro Heavy Duty) load cycle in NABL-accredited laboratories and printed on the packaging. They help you compare tested runtime across capacities. They do not predict lifespan, and real backup varies with temperature, battery age, the inverter used and state of charge. The full figures are on Okaya's Certified Backup Hours page.
Should I choose an SJT or a TT battery?
The choice mostly comes down to capacity, available space and how you prefer to top up water.
Warranty is the total of flat and pro-rata periods and varies by model.
For a closer side-by-side, read the comparison of Super Jumbo Tubular vs Tall Tubular batteries. To find a nearby outlet for advice on sizing, use the dealer locator.
What warranty and service come with these batteries?
Warranty registration is paperless, and Okaya offers PAN India onsite service. For help, call Okaya Care on +91 9818 909090 or write to care@okaya.in.
Frequently Asked Questions
What is the difference between SJT and TT inverter batteries?
SJT (Super Jumbo Tubular) is lower and more compact, covering 110Ah to 160Ah, with all water inlets on one side. TT (Tall Tubular) is taller, covers 160Ah to 310Ah and uses a vent-plug and float design for spill-free topping.
How long does an Okaya SJT or TT battery last?
Okaya's FAQ gives a typical service life of 4 to 6 years with proper care. Total warranty is 48 to 60 months on SJT models and 48 to 66 months on TT models, depending on the model.
Does a faster-charging battery last longer?
Not necessarily. Faster recharge gets the battery ready sooner, but lifespan depends more on discharge depth, maintenance, charging quality and temperature. Okaya's recharge claim is for SJT versus conventional Jumbo Tubular batteries.
How often does an SJT or TT battery need water?
Okaya states that most models need only 1 to 2 top-ups a year. Six ceramic water-level indicators help you check levels.
What is the size of an SJT battery?
The SJT container measures 540 x 210 x 317 mm, about 21.3 x 8.3 x 12.5 inches, for 110Ah to 160Ah models.
What is the size of a Tall Tubular battery?
TT batteries from 160Ah to 260Ah measure 508 x 198 x 404 mm, about 20.0 x 7.8 x 15.9 inches. The 310Ah model measures 510 x 215 x 413 mm.
What are Certified Backup Hours?
They are backup times Okaya declares at set loads, tested under the UMHD load cycle in NABL-accredited laboratories and printed on the packaging.
Which is better for a 2BHK home, SJT or TT?
Okaya suggests around 160Ah for a typical 2BHK, which is available in both designs. Choose SJT if space is tight and TT if you prefer the taller format or plan to go higher in capacity.
To compare the battery price and cost of inverter battery across capacities, check the Okaya shop.
For a compact SJT option, see the okaya battery 140ah price for the 48-month model.
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