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Hybrid & EV Battery Specialists

What a 3-Year Hybrid Battery Warranty Actually Covers

What a 3-Year Hybrid Battery Warranty Actually Covers — EnerCellix

Short answer: our warranty runs 3 years or 100,000 km, whichever comes first, against manufacturing defects. If a module fails we replace that module — not the whole pack — because a pack rarely fails as a unit. The replacement module is supplied free; freight in both directions is not covered.

Why module-level replacement is the honest structure

A hybrid pack is 20 to 40 modules in series. They do not all fail together. What actually happens is that one module drifts below the rest, the ECU sees the spread and shuts the pack down — the other 27 modules are still serviceable.

So the failure is almost never “the whole pack died”. A warranty that promises a complete new pack sounds better but does not describe how these systems fail. Replacing the failed module is what actually restores the car.

What is covered

Covered Not covered
Manufacturing defects in the cells or module assembly Damage from misuse or abuse
Premature capacity loss within the warranty period Damage from incorrect installation
Module failure identified by block voltage data Unauthorised modification or repair
Replacement module supplied free of charge Freight in either direction

What “incorrect installation” means

It is not a catch-all. It means the failure traces back to how the pack was fitted — a reversed connection, a pinched cable, a service plug left unlatched, a pack dropped during the swap. It does not mean “you fitted it, so we are out”.

This is a high-voltage job. We recommend a qualified hybrid workshop: not because a competent DIYer cannot do it, but because the consequences of getting it wrong are expensive on both sides.

How a claim actually works

  1. Send the serial number from the pack label and a scan of the fault codes.
  2. We compare the block voltage data with the test report that shipped with your pack.
  3. If a module is at fault, we send the replacement module.
  4. You fit it, or your workshop does, and we close the claim in writing.

No diagnostic fee. No “send the whole pack back so we can look at it” — which is the part that usually costs the customer weeks.

Why the warranty is not longer

Because the pack is a wearing part. A 10-year-old car with a new pack will still put the pack through the same duty cycle that wore out the original. A three-year window with a clear module-level promise is more useful than a longer headline that is hard to claim against.

Before you buy: two things that matter more than the warranty length

  • Is the pack brand new, or rebuilt? A rebuilt pack from mixed donor cells will fail earlier regardless of the warranty wording.
  • Was it matched? Capacity, internal resistance and open-circuit voltage should be graded and matched before assembly — ΔV under 5 mV. That is what keeps a pack even for years.

Frequently asked questions

Does the warranty transfer if I sell the car?

The warranty follows the pack, not the owner. Keep the serial number with the vehicle paperwork.

What if the pack fails abroad?

The warranty is worldwide. The module ships to you; freight is at your cost, as above.

Why is freight excluded?

Because a hybrid module is Class 9 dangerous goods, and international freight on it costs more than the module itself in some markets. Covering it would have to be priced into every pack, including the ones that never fail.

Need a NiMH pack for a specific vehicle?

We build 7.2 V, 9.6 V and 14.4 V modules into 144 V–288 V packs, with a capacity and resistance report per unit.

Browse battery packs → Send your VIN

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