How do I know if my lithium battery has fake capacity?

You can calculate it by dividing the total Watt-hours of run-time (load in Watts multiplied by hours of backup) by the battery nominal voltage. If it is significantly lower than the label, the capacity is fake.

What is the new 2026 BIS rule for lithium batteries in India?

As of 2026, BIS has mandated rated capacity verification under Clause 7.3.1 of IS 16047 (Part 3) in addition to IS 16046 safety tests. Manufacturers must prove actual capacities in recognized labs.

Why are some lithium batteries so cheap on local markets?

Cheap unbranded lithium batteries are typically built using recycled or B-grade EV cells, which have lower capacity, shorter lifespans, and lack proper BIS certification.

The 2026 Inverter Battery Scam: How to Avoid Fake Capacity and Check BIS Certifications

Have you recently purchased or are you planning to buy a lithium inverter battery? If yes, you need to be extremely careful. One of the biggest scams plaguing the energy storage industry in India today is fake battery capacity.

Unscrupulous local suppliers are selling batteries labeled as "150Ah" or "200Ah" that actually only deliver 80Ah or 100Ah under real-world usage.

To address this growing issue, the Bureau of Indian Standards (BIS) has introduced strict new directives in 2026 for mandatory rated capacity verification of lithium-ion batteries. In this guide, we will expose how these scams work, explain the new 2026 BIS capacity rules, and teach you how to verify that you are getting exactly what you pay for.

How the "Fake Capacity" Scam Works in India

Scammers use several deceptive techniques to cheat unsuspecting buyers:

1. Re-labeling Graded or Recycled EV Cells

Many cheap lithium batteries sold in India use recycled cells harvested from old electric vehicles (EVs) or rejected B-grade/C-grade cells. These cells have already lost 20% to 40% of their original capacity, but sellers package them into a new box and print a fake sticker claiming a high capacity like "150Ah".

2. The Weight Trick

In traditional lead-acid batteries, weight is often correlated with capacity. Some local sellers fill empty space inside the battery casing with glass sheets, heavy plastic, or low-quality lead plates to make the battery feel heavy and authentic, while the active capacity remains extremely low.

3. Falsifying BMS Readings

Many lithium batteries include a digital battery status display. Scammers program the Battery Management System (BMS) firmware to display a fake capacity percentage (e.g. showing 100% charge for a long time) or misreport the total Ampere-hours (Ah) on the screen.

The New 2026 BIS Regulations: Mandatory Rated Capacity Verification

To protect consumers and clean up the market, the Bureau of Indian Standards (BIS), under directives from the Ministry of Electronics and Information Technology (MeitY), has mandated a new regulatory layer for lithium batteries:

[!IMPORTANT] Key Update (2026): In addition to safety testing under IS 16046 (Part 2):2018, all lithium batteries must now undergo mandatory capacity verification according to Clause 7.3.1 of IS 16047 (Part 3):2018.

What does this mean for manufacturers?

Discharge Performance Tests: Manufacturers must prove their cells and battery packs deliver 100% of their labeled rated capacity under a standard discharge performance test conducted at a controlled 20°C temperature.
Third-Party Labs: Testing must be conducted at a BIS-recognized third-party laboratory.
Enforcement: Any manufacturer caught misdeclaring capacity faces license suspension, product recalls, or complete cancellation of their BIS approval.

How to Verify Your Inverter Battery's Capacity and BIS Registration

Before paying for any lithium battery, follow these verification steps to protect your investment:

1. Check the BIS R-Number

Every genuine BIS-registered battery must display the standard IS 16046 mark along with a unique Registration Number (R-Number) (e.g., R-XXXXXXXX).

Go to the official BIS CRS Portal.
Enter the R-Number to verify that the manufacturer's name, brand name, and the specific battery model are officially registered and active.

2. Verify the Cell Grade

Ask the manufacturer for the datasheet of the cells used. Premium batteries use Grade-A Prismatic Cells from reputed global manufacturers. Avoid any brand that refuses to disclose their cell source or uses cylindrical cells of unknown origin.

3. Perform a Simple Backup Test

You can estimate your battery's capacity by running a known load:

Fully charge the battery.
Connect a constant load (for example, two BLDC ceiling fans and four LED lights, drawing a total of ~100 Watts).
Measure how many hours the battery lasts.
Formula: $$ ext{Energy (Wh)} = ext{Load (Watts)} imes ext{Backup Time (Hours)}$$ $$ ext{Capacity (Ah)} = rac{ ext{Energy (Wh)}}{ ext{Battery Voltage (V)}}$$ For example, a 12.8V 100Ah battery stores $1280 ext{ Wh}$ of energy. Running a $100 ext{W}$ load should last approximately $12.8 ext{ hours}$. If it shuts down in 6 hours, you have been scammed with a fake 50Ah battery!

The Mecanum Guarantee: Certified, Grade-A Capacity

At Mecanum Energitech, we believe in absolute transparency:

100% Grade-A Cells: We use only fresh, certified Grade-A LiFePO4 cells.
True Rated Capacity: Our 12V, 24V, 48V, and 96V batteries are fully tested to exceed their rated capacity (e.g., our 100Ah battery actually delivers 102Ah to 105Ah under standard discharge tests).
Full BIS Compliance: All our products comply with the latest IS 16046 (Part 2) safety standards and the new 2026 IS 16047 capacity verification guidelines.
Smart Active BMS: Our BMS displays real-time, accurate cell voltage and state-of-charge parameters with zero faked telemetry.

Don't fall for cheap "deals" on unbranded lithium batteries. A lower price tag almost always means fake capacity, recycled cells, and a high risk of premature failure.

Check out our fully certified LiFePO4 range or use our Smart Power Planner to find the exact capacity your home actually needs.