LG Home Batteries: RESU Range and Warranty

An LG home battery is a lithium-ion storage unit sold under the RESU name, originally by LG Chem and now by LG Energy Solution. The range has been fitted in UK homes for years, and the model numbers still in service run from 3.3kWh up to 10kWh. The single most important thing a household needs to know about it is not a specification: it is that a live recall covers a long list of RESU models, and LG Energy Solution is replacing affected units free of charge¹.

The recall notice names RESU3.3, RESU6.5, RESU10, RESU13, RESU7H Type C and R, RESU10H Type C and R, and RESU10M, and states plainly that "the recalls have expanded to include additional models and batteries"¹. Electrical Safety First, the UK charity that publishes product recall information, confirms that LGESS are replacing all potentially affected ESS Home Batteries². Any warranty discussion on this page sits behind that fact.

What follows covers what the range offers in the UK, the specifications, what the warranty covers, what an installation costs, the company's status, and what the whole picture means for a household's energy independence.

What the RESU range offers in the UK

LG ESS Home Batteries are installed as part of a residential solar system, allowing owners to capture and store energy from their panels¹. That is the design intent: the battery sits behind the meter, charges from solar generation or cheap grid electricity, and discharges into the home when demand exceeds supply. Excess generation is exported to the grid⁶.

The UK market position is unusual for a battery brand, because the recall is the dominant fact rather than the product line. The recall portal is the maker's own, and it is where model numbers, remedies and the diagnostic software process are set out¹. Electrical Safety First carries the recall as a UK product safety notice, which is the route most owners will encounter it through².

For a household, the practical consequence is that any LG battery already installed should be checked against the current affected list rather than an earlier version of it, because the scope has widened¹. For a household considering a new LG battery, the position is that the maker's own recall programme is the most current public statement about the product family in the UK.

Compatibility with third-party inverters has been part of the range's appeal. In December 2019 Ginlong announced that its Solis storage inverter was compatible with LG home battery RESU, including the RESU 48V line-ups for residential hybrid inverter applications. That kind of pairing is what allowed LG batteries to be retrofitted to existing solar systems rather than sold only as part of a matched package. Supported battery lists change over time, so any retrofit should be checked against the current list for the specific inverter.

Specifications: 3.3kWh to 10kWh across two voltage families

The recall notice is the most detailed public listing of the models sold, and it doubles as a capacity guide. The low-voltage RESU line covers RESU3.3, RESU6.5, RESU10 and RESU13. The high-voltage lines cover RESU7H Type C and R, RESU10H Type C and R, and RESU10M¹. The numbers in the model names correspond to nominal capacity in kilowatt hours.

Capacities in this range sit alongside the wider UK market. Independent guidance describes a typical 5kWh battery system, and a case study of a UK household with solar and an electric vehicle records an 8.2kW home battery installed alongside the array⁶. The RESU line spans both ends of that spread, which is why it was fitted across small flats and larger family homes alike.

Two things determine what a given capacity actually delivers. The first is usable capacity against nominal, which is set by the battery management system and the depth of discharge the maker permits. The second is round-trip efficiency, the share of energy put in that comes back out. Both are covered in more detail on battery capacity and usable capacity and round-trip efficiency.

What the warranty covers, and what the recall overrides

The recall remedy is the operative protection for affected units, and it is stronger than a warranty in one respect: it does not depend on the household proving a fault. LG Energy Solution states that it "will replace all affected batteries for free or provide a new module and remove the battery from your premises"¹. For batteries already shut down by the diagnostic software, it will replace them and remove them from the property at no cost to the owner¹.

The scope has widened over time. The notice tells owners to check again "because the recalls have expanded to include additional models and batteries"¹. That matters for anyone who checked an earlier version of the list and concluded their unit was unaffected.

Beyond the recall, home battery warranties in the UK are generally written around retained capacity and throughput rather than a simple calendar term, and the conditions attached to them vary by maker and installer. The general mechanics are set out on home battery warranties. Where a battery has been recalled, the recall remedy takes precedence over the ordinary warranty route, because the maker is removing or replacing the unit rather than repairing it in place.

What an LG home battery costs

There is no published LG list price for a UK installation. Prices are installer-quoted after a survey, and the figures that exist are for home battery storage generally rather than for LG specifically.

Independent guidance puts home battery storage at £1,500 to £10,000 depending on the type and size of battery, with a 5kWh battery system around £4,600³. The same figures appear in a second independent guide, which gives the range as £1,500 to £10,000 and the 5kWh system cost as around £4,600⁷. A trade guide gives a lower entry point, with battery systems typically starting from around £4,000⁴.

Official guidance from the Parliamentary Office of Science and Technology, published in June 2026, states that battery storage costs can be up to £10,000 depending on size, with a typical 5kWh system around £4,600⁷. The three sources converge on the same shape: a floor in the low thousands, a mid-point around £4,600 for a small system, and a ceiling near £10,000 for larger installations.

VAT treatment is not stated in these figures, so they should be read as quoted rather than as confirmed VAT-inclusive prices. The wider cost picture, including what drives a quote up or down, is on how much a home battery costs.

The company's status

LG Chem and LG Energy Solution are the same corporate battery business under different names across different periods, and the RESU line has passed from one to the other. The recall portal is operated by LG Energy Solution, and the remedy is offered by LGESEG, the entity named in the notice¹.

The company is trading and is running an active replacement programme rather than winding one down. Electrical Safety First, which publishes UK product recall notices, records that LGESS are replacing all potentially affected ESS Home Batteries². That is a live programme, not a closed one.

For a household, the distinction that matters is between the maker's status and the installer's. A battery is only as good as the firm that fitted it and the route to remedy if something goes wrong. The recall route runs through the manufacturer directly, which insulates owners from an installer that has since ceased trading. The general position on recalls, including how to check a unit and what a notice obliges a maker to do, is on home battery recalls and safety notices, and the specific LG case is covered on the LG ESS home battery recall.

What it means for energy independence

A home battery's contribution to independence is measurable, and the measure is self-sufficiency: the percentage of electricity consumed in the property over a year that is met by behind-the-meter solar or electrical energy storage⁸. A narrower definition used in the same standard is the fraction of electricity consumed in the property that is met by self-consumed electricity⁸.

What a battery does not do is take a home off the grid. It remains connected, imports when stored energy runs out, and exports surplus generation⁶. Combining solar with a home battery lets a household store renewable electricity to power a heat pump, which reduces reliance on grid electricity⁹. That is a reduction in dependence, not an end to it.

The dependence that remains with an LG system is specific. The household stays on the grid and with a supplier for import and export. It depends on the manufacturer for the recall programme, the diagnostic software and any replacement. It depends on the installer for the original commissioning and any later work. And it depends on the inverter, which in a retrofit may be a different brand entirely, for the system to function at all.

Safety is the other side of the ledger. Government guidance notes that there have been few recorded fires involving domestic lithium-ion battery storage systems⁵. Lithium-ion cells are already common in UK homes, in laptops, mobile phones, e-scooters, e-cigarettes and mobility vehicles¹⁰. Fire services publish separate guidance on lithium-ion batteries in the home, and the general risk picture is covered on how safe home batteries are and home battery fire safety.

Where the range sits in the wider market

LG is one of several battery makers whose products are sold in the UK, and the RESU line competes with systems built around different chemistries and form factors. The differences that matter to a household are capacity, whether the system is AC or DC coupled, whether it is modular, and what the warranty terms actually commit the maker to. Those are covered on AC-coupled and DC-coupled battery systems, home battery chemistries and modular and stackable battery systems.

Government support for home energy measures has run through schemes such as the Green Homes Grant Local Authority Delivery and the Home Upgrade Grant, both of which funded the installation of energy efficiency measures in domestic properties¹¹. Those schemes are recorded in official statistics published in August 2025¹¹. Battery storage has also been the subject of parliamentary research, reflecting its role in domestic decarbonisation¹².

Plug-in battery storage, a newer category, is already being developed for the UK market¹³. That is a different product class from a fixed RESU installation, and it is covered on plug-in and balcony battery storage.

For a household weighing an LG battery today, the position is straightforward. The range covers 3.3kWh to 10kWh across low and high voltage families, it has been widely fitted in UK homes, and it is subject to an active recall that the maker is funding. The recall is the first thing to check, and the current affected list is the one that counts.