Exide InvaMaster IMTT1500 Review: 150 Ah Tall Tubular Battery

The Exide InvaMaster IMTT1500 is for households pairing a 150 Ah battery with a single-battery home inverter, who want a mainstream brand with a dealer nearby. It is a tall tubular battery from Exide’s standard range. The trade-off is clarity: listings disagree on the warranty split and even the dimensions, and some retailers advertise backup times that the battery’s own capacity cannot support.

How long will a 150 Ah battery run my home?

Backup depends on your load. As a rough calculation, not a test: 12 V × 150 Ah is 1.8 kWh nominal. Using 80% of that, the depth of discharge Exide quotes for its cycle rating, through an inverter around 85% efficient (Luminous lists 85% for the Zelio+ 1100) leaves about 1.2 kWh. At a 400 W load that is roughly 3 hours; at 200 W, roughly 6. A retailer page promises 4–6 hours at 400 W, which looks optimistic. The 150 Ah rating is at C20, a slow 20-hour discharge, so real capacity at a faster discharge is lower still.

What does the warranty really cover?

Most listings, including an Exide dealer’s, give 60 months: 36 months of free replacement plus 24 months pro-rata, where you pay a share of a new battery. But some Flipkart listings for the same model show 54 months (36 + 18). Flipkart lists the cover as backup issues, not physical damage, and says Exide sends an engineer within 24–48 hours after you register a complaint on its toll-free line. Ask the seller to write the split on the invoice.

How long does a tall tubular battery last?

Exide rates this range for 1000 cycles at 80% depth of discharge. In a home with one deep cut a day, that is close to three years of full cycles; shallower daily use stretches it further. Heat shortens lead-acid battery life, so keep it out of a hot balcony or kitchen.

How much upkeep does it need?

This is a flooded battery with 18 L of electrolyte, so the water level needs checking and topping up with distilled water every few months, per general lead-acid practice. It weighs about 56 kg filled, per Flipkart, so plan for two people and a trolley at installation.

What do owners say?

The Flipkart listing we read shows 3.8 out of 5, but the rating count was not visible, and we saw no written reviews. Exide’s dealer and service network is among the widest in India, which matters more for a battery than any single spec.

What we could not verify

Exact dimensions (listings give both 497 × 190 × 415 mm and 535 × 215 × 485 mm), the official warranty split on Exide’s own site, and any independent capacity test.