Frequently asked questions

Start with the voltage of your system (12, 24, 36, 48, 60 or 72 V). Then choose the capacity (Ah) based on your consumption:

Ah ≈ (watts × hours) ÷ volts

If you use an inverter (230 V), add 10–15% for losses. Use our battery finder, or call us – and we'll work it out together with you.

Calculate the battery's energy in Wh: volts × Ah. A 12V 100Ah battery holds approx. 1.28 kWh (1,280 Wh).

Divide by your consumption: if you use 400 Wh per day, a 12V 100Ah battery will last approx. 3 days without charging. On the product pages, you can see guideline run times for typical appliances.

Motorhomes, caravans and smaller boats typically run on 12 V. For larger systems with an inverter – e.g. from approx. 2–3 kW – 24 V or 48 V is often better: a higher voltage means a lower current, so you can use thinner cables and get lower losses.

Golf carts and other electric vehicles need the same voltage as the vehicle (e.g. 36, 48 or 72 V).

• Ah (amp hours) – how much current the battery can deliver over time.
• Wh/kWh (watt hours) – how much energy is stored in the battery: volts × Ah. 1 kWh = 1,000 Wh.
• W (watts) – how much power an appliance is using right now.

Always compare batteries in Wh/kWh if they have different voltages.

One battery with the capacity you need is the simplest option: fewer cables, no balancing between batteries and easier troubleshooting. Several batteries let you expand later – but they must be the same model, capacity and age.

Our LiFePO4 batteries are leisure batteries (deep cycle) designed to power equipment over longer periods. Don't use them to start an engine unless the product page says the model is designed for it.

Compare the motor's power consumption with the battery's continuous current and peak current on the product page. The battery must be able to deliver more than the motor draws – including at start-up. If in doubt, send us the motor's specifications and we'll help.

We have LiFePO4 batteries (lithium iron phosphate) from 12 V to 72 V:

• 12V lithium batteries – for motorhomes, caravans, boats and solar.
• 24V and 48V batteries – for larger off-grid systems and energy storage.
• 36V, 60V and 72V – for golf carts and electric vehicles.
• Rack batteries, battery boxes and EVE cells for your own projects.
• Special batteries – battery packs for e.g. e-bikes, golf trolleys and other purposes.

Yes, if it has a LiFePO4/lithium profile or can be set to approx. 14.2–14.6 V (12 V). Equalisation, desulphation/"repair" and temperature compensation must be switched off.

A pure lead-acid charger that stops at approx. 13.8 V won't fully charge the battery and can't balance the cells. In that case, we recommend a lithium charger.

Typical values for LiFePO4 – the datasheet for your model always takes precedence:

For 36, 60 and 72 V: multiply 3.55–3.65 V by the number of cells stated in the datasheet. See also the user guide.

Yes, and we recommend a DC-DC charger (B2B). It limits the current so the alternator isn't overloaded, and provides the correct charge voltage for lithium. See e.g. Victron Orion DC-DC.

A smart alternator lowers the voltage while you drive, so a standard DC-DC charger may think the engine is off. Choose a DC-DC charger with a smart alternator setting, and connect a signal from the ignition (D+) if needed. Call us with your vehicle's model and year, and we'll find the right solution.

Yes, if the controller has a LiFePO4 profile or can be set manually: charge voltage 14.2–14.6 V (12 V), float approx. 13.5 V or off, and equalisation off. An MPPT controller makes better use of the solar panels than PWM.

Many control panels and built-in chargers in motorhomes and caravans have a LiFePO4 setting. Check the manual – or send us the model name and we'll check it. If it has no lithium profile, you can charge via a separate lithium charger or DC-DC charger.

As a rough guide: capacity (Ah) ÷ charger current (A) – plus a little extra at the end. An empty 12V 100Ah battery with a 20 A charger takes approx. 5–6 hours.

No. Lithium is fine with partial charging. However, do fully charge it regularly – e.g. once a month – so the BMS can balance the cells and the app shows the correct state of charge.

Typical causes:

• The charger is set to a lead-acid profile or too low a voltage.
• The battery is below 0 °C – in which case the BMS stops charging.
• A single cell is full before the others. Charge at 14.2–14.4 V (12 V) for longer so the cells can balance.
• The charge current is higher than the battery's max. charge current.

Stay below the battery's max. charge current shown on the product page. A gentle charge current is approx. 0.2–0.5C – i.e. 20–50 A for a 100Ah battery.

Yes, but via a charger – e.g. a lithium charger or an inverter/charger such as the Victron MultiPlus. Never connect the generator directly to the battery.

BMS stands for Battery Management System – the battery's built-in control system. It protects against overcharging, deep discharge, excessive current, short circuits and excessively high or low temperatures. It also balances the cells so they have the same voltage.

All LithiumPro batteries with JK BMS: download JK BMS from the App Store or Google Play (also listed as JIKONG BMS).

LithiumPro 12V 50Ah (the world's smallest): download Xiaoxiang Electric – the icon is a white elephant on a blue background. If the app plays up, you can use Overkill Solar (iPhone and Android) or Fusion BMS (iPhone).

• Connect inside the app – not in your phone's Bluetooth menu.
• Turn on Bluetooth, and on Android, also location for the app.
• Only one phone can be connected at a time. Close the app on other phones.
• Move close to the battery (within approx. 10 m).
• If the battery is fully discharged, the BMS may have turned off Bluetooth. Charge it and try again.

Lithium has a very flat voltage curve, so the percentage is calculated from the current flowing in and out – and it can drift slightly over time. Fully charge the battery to reset the display to 100%. Use the app rather than a display on the battery as your main source.

No. The BMS is set at the factory for the battery's cells. Do not tap presets such as LiFePO4, Li-ion or LTO, and do not change protection values. Any changes are made at your own risk and are not covered by the warranty or your statutory rights.

Usually not. The BMS has switched the battery off to protect the cells. Remove all loads and connect a charger with a LiFePO4 profile – some chargers have a special function to "wake up" lithium batteries. Charge as soon as possible: if the battery is left fully discharged for a long time, the cells can be permanently damaged. Contact us if it doesn't wake up.

• Low voltage: the battery needs charging soon.
• High temperature: switch off the loads and move the battery somewhere cooler.
• System fault: contact our support team if the fault doesn't clear after cooling down and restarting.

Our LiFePO4 batteries with EVE Grade A cells handle over 9,000 charge cycles at 80% depth of discharge and have an expected lifespan of up to 20 years. The lifespan depends on how deeply you discharge, the temperature and how the battery is charged.

You can use up to approx. 90% of the capacity without damaging the battery. If you recharge before the battery is completely flat, it will last longer. A 12 V battery must not be discharged below 10 V.

LiFePO4 is one of the most thermally stable lithium chemistries, and the BMS protects against overcharging, short circuits and excessive current. The risks come from physical damage, short circuits, incorrect charging or charging in frost – so follow the user guide.

Batteries must never be thrown away with household waste. If you bought the battery from us, we'll take it back – contact us first and we'll agree on how it should be dropped off or sent. You can also take it to your local recycling centre. LithiumPro is registered with Dansk Producentansvar. Read more about used batteries.

Yes. As a private customer, you have a 14-day right to cancel from the day you receive the item. Notify us in writing at info@lithiumpro.dk within those 14 days. You then have 14 days to return the item.

You pay the return shipping yourself. We refund the purchase amount, including the original shipping, no later than 14 days after we have received the item. Custom-made batteries and customised solutions cannot be cancelled. Read more and find the cancellation form on our right to cancel page.

Contact us before you send anything. Lithium batteries are dangerous goods, and not all carriers are allowed to take them. We'll tell you how the battery should be packed and shipped. Ideally, use the original packaging.

• LithiumPro batteries: 3-year warranty from the date of purchase.
• Extended warranty: extend by 5 years to a total of 8 years for 10% of the battery price. It must be purchased in the same order as the battery.
• Victron: up to 5-year manufacturer's warranty.
• Deye inverters: up to 10-year manufacturer's warranty.

The exact warranty is stated on the product page. Read the terms in our terms and conditions.

The warranty covers faults in the battery itself – e.g. if the cells, BMS or electronics fail. We then troubleshoot and repair it at our expense, and in the worst case you get a new battery.

It does not cover a battery that has been dropped or knocked, opened or modified, installed incorrectly or short-circuited, charged with the wrong charger or voltage, loaded beyond its specifications, or has water or fire damage – nor normal loss of capacity over time.

Statutory rights give you a legal right to claim for 24 months if the item was faulty when you received it. The warranty is our additional promise of 3 years (or 8 years with the extended warranty) on LithiumPro batteries. The warranty does not limit your statutory rights.

Email info@lithiumpro.dk with:

• your order number
• a brief description of the problem
• photos or video – and ideally a screenshot from the app
• the battery's serial number, if you have it

Don't send the battery until we've agreed on it. We'll assess the case and find a solution: repair, replacement or refund. See the full procedure under warranty and claims.

Take photos of the packaging and the item, and contact us as soon as possible at info@lithiumpro.dk. We'll then help you find a solution and with any claim against the carrier. Do not use a battery that is damaged.

No. The extended warranty must be purchased in the same order as the battery and only applies to the battery it was bought for.

Yes. Our batteries can be used with Victron chargers, inverters, MultiPlus and SmartSolar MPPT – set to LiFePO4 as shown in the table under "Charging and chargers". Selected models have CAN/RS485. If the battery needs to communicate with a Victron GX system, ask us before you set it up.

Yes. Victron Smart LiFePO4 batteries must be used with a Victron BMS – e.g. smallBMS, VE.Bus BMS V2, Lynx Smart BMS or Smart BMS CL 12/100, depending on the system. Our own LithiumPro batteries have a built-in BMS.

A standard inverter converts 12/24/48 V from the battery into 230 V. A hybrid inverter can also manage solar panels, the battery and the grid at the same time – and many have a backup output.

Yes. Call us and we'll help with the settings in VictronConnect. If you've forgotten the PIN code for a Victron product, it can be reset using the PUK code on the product label.

Support and sales are open 24/7. Call +45 60 46 84 10 or email info@lithiumpro.dk. You can also use the form on our contact page.

Yes. Our shop at Bringstrupvej 71, 4100 Ringsted is open 10am–8pm by appointment. Call +45 60 46 84 10 to book a time.