Mobile Car Battery Replacement offers a 12 Month Limited Warranty on car batteries Installed by Mobile Car Battery Replacement Customers must provide a valid proof of purchase receipt at the time the warranty claim is requested.

The customer is responsible for a mobile service fee starting at a rate of £60 if customer doesn’t comply with terms which includes: merely discharged product, damage to the battery caused by abuse or neglect, destruction by damage to batteries which are opened or tampered with in any manner including the introduction of any special additives or electrolyte into the battery.

In addition, any non-factory accessories that cause malfunction or damage to the battery will not be covered.

Customer will be charged full amount for a new replacement battery, if the customer doesn’t comply with warranty terms.

If battery which installed by Mobile Car Battery Replacement mechanics if opened or tampered means installed by other mechanics warranty will be voided.


In the instance of a warrantied product failing you must contact us. In most circumstances a replacement battery will be replaced by Mobile car battery replacement. Our team will diagnose the fault over the phone or by email. We sometimes request the voltage and cca of the battery checked by the customer so we can condemn it.

This warranty does not apply to batteries that break or fail to abuse or neglect such as

  • Incorrect or under specified battery type fitted to a vehicle or application
  • Charge system problem/incorrect charging creating an overcharge or under charge situation
  • Prolonged storage of a car battery or minimal use of the battery
  • Electrical faults, Shorts, Excessive loads or loose wiring
  • Battery modifications such as terminal changes
  • Deep discharge of leisure batteries or deep discharge application where the battery will perform all of its cycles before the warranty ends

*Manufacture Warranties are non-transferable*

We cannot exchange a flat (discharged) battery, only faulty products. If something on the vehicle has drained the battery, or the alternator has failed, this would not cover under warranty. Below is Battery State of Charge chart.

Testing a faulty battery

Before we can accept replacement of a faulty battery, you should have the battery VOLTS & CCA (Cold Cranking Amps) tested locally likes ATS, Kwik fit or Halfords.

Our product warranties cover product replacement only i.e. we guarantee the product against physical failure for the duration of x years (usually 3-4) We will supply a replacement battery in the instance of product failure during that period.

Machinery, Tractors, Taxi vehicles, Black Cabs using 643, 663, 644, 664 type commercial batteries are only guaranteed for 12 months due to extreme usage. Start Stop Taxi are given 3 years warranty with AGM battery types.

We do not accept product returns or refunds, we offer only replacement service that are caused by vehicles with malfunctioning alternators** We also do not accept product returns from owners of vehicles that are driven for less than 80 miles per week. Where the vehicle is driven less than 80 miles per week the battery is not charged regularly enough to be considered normal operation. We would advise the regular use of a battery maintenance charger.

This includes Leisure Batteries such as those used in Motorhomes, Caravans, Boats etc. Where a leisure battery has been left uncharged for such a period of time as to cause the battery to sulphate.

We recommend Leisure Batteries should be kept above 12.10 volts, Your warranty will be void if the battery has been discharged below 10.60 volts (100% discharged).

Negligence on your part may be investigated if we doubt that your claim is genuine.

(** The vehicle’s alternator re-charges the battery whilst the engine is running)

How does the warranty work?

 The list below outlines some battery issues that are not manufacturing defects and are not covered by warranty.

  • Overcharing. This can be caused by a fault in the vehicles charging system.
  • Sulphation. This can happen if the vehicle is stood for long periods without use. Its recommended to recharge the battery once a month if the vehicle is doing less than 4000 miles a year.
  • Misuse. Wear and tear from over tightening terminals or any other physical damage caused by misuse.
  • Incorrect Application. The battery must be used on a vehicle with an alternator and must be used for the vehicle with the given registration number only.


Non-Manufacturing Faults

The warranty does not covered faults that are not due to a manufacturing issue. Examples of non-manufacturing faults are described below.


Sulphation occurs when a battery is allowed to stand in a discharged state for an excessive amount of time. When a battery voltage drops below a certain level, a chemical reaction known as sulphation takes place. In most cases this voltage is at or below 12.06v. Sulphation is normally irreversible, and can permanently impair performance of the battery, causing reduced performance and premature failure. Sulphation can be seen as a fine white/grey coating on the plates.

This damage can be caused if a battery is stored for long periods without charging, or installed in applications that are not frequently used, i.e. tractors, boats and motorbikes. Vehicles are prone to discharging batteries as there is always a permanent drain form vehicle clock, alarms etc. Over time, sulphation will build up on the plates, and hinder the performance of the battery.

It is worth noting that under normal operating conditions a battery cannot become discharged on its own (unless left for a long period of self-discharge). The reason for this discharge is normally caused by one of the following; malfunctioning alternator, regulator, or starter motor, slipping fan belt, electrical fault, excessive use of electrical items such as heated seats, air conditioning etc, long standing time without recharge, boot light/glove box malfunction, vehicle lights being left on, etc./p>

As sulphation is easily avoided by simply keeping your battery charged, this is a non-manufacturing fault.

Wear and Tear, and Deep Cycling

When a battery is charged and discharged, material from the battery plates (active mass) is in motion, through the electromechanical reaction that produces electricity. Every time a battery goes through a charge-discharge cycle, a small amount of this active mass is lost from the plates. Due to so many factors impacting on the life of a battery, it is impossible to stipulate a minimum or maximum life expectancy.

Every battery has a finite number of cycles that it can go through before it loses its active mass, and in turn, its capacity. Vehicles with high usage, such as busses, taxis and trucks, will often put a battery through this finite number of cycles over a much shorter amount of time, causing a battery to show the above symptoms after only a couple of years. This is not a manufacturing fault.

When a battery is subject to a deep discharge, and/or a rapid rate of recharge, the above process is accelerated. A battery that is deep discharged regularly, or is often discharged blow 50% (12.1v) in the case of leisure batteries, will rapidly lose its active mass, and capacity. An example of this is the use of a leisure battery for running window cleaning water pumps. The loss of active mass, and therefore capacity due to over/excessive cycling is not a manufacturing fault.


If a battery is charged at an excessive voltage or current, it can overheat, and the electrolyte will start to evaporate. Overcharging will cause the active mass in the plates of the battery to rapidly breakup, and battery performance will be permanently affected, as will the cyclic life of the battery.

This is normally quite obvious to spot when examining the battery. During charging, there may be a pungent smell of rotting eggs. When off charge, the battery will have low levels of acid, and there may be a black coating on the filler caps (It is not possible to check the levels or maintenance free batteries). This is not a manufacturing fault.

Physical damage

Any physical damage that occurs to the battery terminals or casing due to improper fitment, if the battery is dropped, if any connectors are hammered on to the terminals, or if connectors are not properly fastened, the battery may fail rapidly. This is not a manufacturing fault.

Incorrect application

Fitting a smaller or less powerful battery, or the incorrect type of battery for the application will result in shortened lifespan and premature failure. This is not a manufacturing fault.

Provided that the correct battery has been selected for the correct application or vehicle, instances of manufacturing faults will be minimum.