Duracell Energy batteries in the UK: Dura5, Dura16 and Dura-i

Duracell Energy home batteries and inverters are made, sold and warranted by Puredrive Energy Ltd, a UK company based in Gloucestershire, under a licence to use the Duracell name. The Duracell trademark owners are not involved: the datasheets we checked say they don't design, make or distribute the products and give no warranties for them. The range is the Dura5 (5.12 kWh) and Dura16 (16 kWh) batteries and the Dura-i hybrid inverter, each with a 10-year warranty on its datasheet. Because the warranty depends on Puredrive, get its full terms from your installer and register the system within a month of installation.

Who stands behind Duracell Energy

Puredrive Energy was founded in 2016 and, by its own account, was awarded the licence to make and distribute Duracell-branded energy storage in 2022, launching the Duracell Energy range in March 2024. Puredrive Energy Ltd (company number 10286123) was listed as active by Companies House on 24 September 2026. Its trading address and warehouse are at Toddington, near Cheltenham, and sales enquiries go to 0808 281 2855.

The licence matters for one reason: your warranty is only as good as Puredrive. The datasheets say "Manufactured under license and warranty supported by Puredrive Energy Limited", and that Duracell Batteries BV, Duracell U.S. Operations and their affiliates "do not make any (and hereby disclaim all) express or implied warranties relating to the products".

Duracell Energy sells through approved installers and "Platinum Partners".

The range and how much you can use

Figures come from the datasheets we checked (Dura5 V5.7, Dura16 V1.2 and Dura-i G3 V1.1, all created in July 2026). Both batteries are 51.2 V lithium iron phosphate (LiFePO4), and more can be added later: the datasheets allow up to 32 Dura5 or 12 Dura16 units in parallel. The Dura16 is wall-mounted only and weighs 122 kg.

Usable capacity is less than the label. The Dura5's usable 4.6 kWh is 90% of its 5.12 kWh (4.6 ÷ 5.12 = 0.90). Duracell Energy's FAQ recommends setting the discharge depth to 86% to help the battery last, which gives 5.12 × 0.86 = 4.40 kWh, and warns that setting it above 90% may void the warranty. Ask your installer which setting they will use.

What one full cycle is worth. The following is an illustrative example, not a saving estimate. Suppose a Dura5 set to 86% is filled from surplus solar that would otherwise be exported, then emptied into the house in the evening instead of buying from the grid. The Dura-i's datasheet gives a maximum battery-to-AC efficiency of 94.3%, so about 4.40 × 0.943 = 4.15 kWh reaches your sockets. At the average capped Direct Debit unit rate for October to December 2026 (26.32p/kWh) that avoids 4.15 × 26.32p = £1.09 of electricity, and you give up the export payment on 4.40 kWh:

• with E.ON Next Flex Export at 6p (open to all, variable, checked 24 September 2026): £1.09 − (4.40 × 6p = £0.26) = about 83p per full cycle;
• with Octopus Outgoing at 12p (needs Octopus as your electricity supplier): £1.09 − (4.40 × 12p = £0.53) = about 56p per full cycle.

This leaves out the price of the battery and its installation. Charging losses aren't in the datasheets for this path, so the real figure is a little lower. It also assumes the house uses at least 4.15 kWh in the evening and that there is enough surplus to fill the battery, which may not happen in winter. For a typical home using about 2,500 kWh a year, a battery mainly moves daytime solar into the evening. It earns more in homes with an EV or heat pump, or on time-of-use tariffs. Our guide to what size solar battery you need helps you match capacity to your evenings, and our calculator models a full year.

If the warranty caps throughput at the datasheet figure, it is unlikely to bite, although we haven't seen the full terms: 35 MWh on a Dura5 equals 35,000 ÷ 4.6 = about 7,600 full cycles, or roughly two a day for ten years. One cycle a day uses about half of it.

Dura-i inverter and grid paperwork

The Dura-i G3 can take up to 10 kWp of panels across two inputs and has a built-in energy meter. For a single-phase home, the size you choose decides your grid paperwork. In Great Britain, a home inverter rated at or below 16 A per phase (16 A × 230 V = 3,680 W on a single-phase supply) connects under G98: the installer fits it and informs the network operator within 28 days. Anything bigger goes through G99, where the operator must approve it first.

The 3.6 kW Dura-i is rated at 3,600 W, but its datasheet gives a maximum output of 3,960 W, above the G98 limit. What decides it is the type-test register entry for the exact model. On 24 September 2026 the Energy Networks Association register listed the PD-DH1P-3.6K-G3 under G98 (record PURED/18525/V1/A2), and the 4.6, 5 and 6 kW versions under G99 Type A, all marked "Compliant". Search under the manufacturer name Puredrive Energy Ltd, not Duracell. Ask your installer for the register entry for your model before you sign; our G98 and G99 guide explains the process.

Duracell Energy and Puredrive batteries can also be paired with Solis S5 or S6 hybrid inverters instead of a Dura-i. Duracell Energy's FAQ notes that Puredrive can view a Solis inverter only when added as a guest, and can't change its settings or firmware, so those systems need Solis or your installer for inverter support.

Power cuts

Duracell Energy's website talks about an "uninterrupted power supply", and the Dura-i datasheet gives a typical switchover time of 10 milliseconds. What stays on is narrower than "your home". The FAQ says the battery supplies a set number of circuits, and only if a critical circuit board has been installed. The power available depends on the inverter size, and the two documents give different figures for the 3.6 kW model: 15.7 A on the datasheet (about 3.6 kW) and 13.1 A in the FAQ (about 3.0 kW). Ask your installer which circuits will be on the backup board and what they can run at once. Our guide to solar panels in a power cut explains the wiring.

The warranty: what you need to do

Duracell Energy doesn't publish its full warranty terms online. Its FAQ says the duration is shown in your warranty registration confirmation. What the FAQ does say:

• Register within a month of installation, on the Duracell Energy website, with the installer's details, the installation date and address, and every serial number. You or the installer can do it.
• Installation must be by a qualified, MCS-registered electrician.
• Second-hand parts void everything. Products bought second-hand from an unauthorised seller have no manufacturer's warranty, and adding a second-hand unit to a warranted system invalidates the warranty for the whole system.
• Selling your home: leave the paperwork with your solicitor and tell Puredrive at support.uk@duracellenergy.com so it can update the registration.
• Discharge depth: settings above 90% on the Dura5 may void the warranty.

Before you pay, ask for the warranty document and check the throughput or cycle limit, whether labour and callouts are covered, and what happens if the Dura-i is paired with another brand's battery.

Should you shortlist Duracell Energy?

Duracell Energy is worth shortlisting if you want a UK-supported battery system with a matched inverter and app, and an installer who is a Duracell Energy approved installer. The Dura5's modular design makes it easy to start small and add capacity later, and in Great Britain the 3.6 kW Dura-i is listed under G98, which avoids a G99 wait. Judge it as a Puredrive product: the familiar name adds no extra warranty backing. Compare the usable capacity and the full warranty terms with other batteries; our battery storage guide sets out what to compare, and set two battery quotes side by side on usable kWh and warranty, not just price.

Before you accept a Duracell Energy quote

• The model codes for each battery and the inverter, and the usable capacity at the discharge depth your installer will set.
• The Dura-i's ENA register entry (listed under Puredrive Energy Ltd), and whether your connection is G98 or G99.
• Which circuits go on the critical circuit board for power cuts.
• The full Puredrive warranty terms, including any throughput limit and labour cover.
• Who registers the warranty, and confirmation that it is done within a month.
• That every unit is new and supplied through Duracell Energy's authorised channel.

Buying a battery: your protections

When one business both sells you the battery and installs it in your home, there is no VAT on it until 31 March 2027; 5% applies after that unless the relief is extended. Since 1 February 2024 that has included batteries added to an existing solar system. A battery bought without installation carries 20%.

Sign at your kitchen table, online or over the phone, and the Consumer Contracts Regulations give you a cooling-off period that lasts until 14 days after the battery, or the last piece of equipment, arrives; you can use it from signing onwards. Our guide to choosing an installer sets out the full rights. Your installer, not Puredrive, is responsible for doing the work with reasonable care and skill. Consumer-code protection now depends on the installer joining RECC or HIES, which MCS no longer requires. RECC limits a member's deposit to 25% and requires an insured guarantee on the installation work that runs for two years at least. In Great Britain, energy suppliers that pay for exported battery electricity do so through their own SEG tariffs, and they'll ask for MCS certification of the installation, or an equivalent scheme's.

Frequently asked questions

Is Duracell Energy made by Duracell?

No. Puredrive Energy Ltd, a UK company, makes, sells and warrants the products under licence. The datasheets say the Duracell trademark owners aren't involved in the products and give no warranties for them.

How much of a Dura5 can I actually use?

4.6 kWh of its 5.12 kWh at the maximum 90% discharge depth, or about 4.4 kWh at the 86% setting Duracell Energy recommends.

Will a Duracell Energy battery power my home in a power cut?

Only the circuits on a critical circuit board, if one has been installed, up to the inverter's backup rating. The rest of the house stays off.

Who do I contact about a Duracell Energy fault?

Start with your installer, who has the commissioning records. Duracell Energy's homeowner support hub and ticket form are at faq.duracellenergy.com, and for warranty registration changes Puredrive uses support.uk@duracellenergy.com.