Battery monitor for life on the road
Know your batteries. Keep your privacy.
Voltsure brings all your Bluetooth battery monitors, BM2, BM6 or BM7, as many as you have, and your Victron Smart devices into one clear, private view of the batteries in your van, motorhome, caravan, car or boat. No account, no tracking, and your readings never leave your device.
Free to download. Voltsure Pro is a one-time purchase, with no subscription.
- No account or sign-up
- Works fully offline
- Never asks for your location
- No ads, analytics or tracking
- Designed and built in the UK
Every monitor, every battery
Mix your monitors. Add as many as you like.
Voltsure reads BM2, BM6 and BM7 Bluetooth battery monitors, including the BM200 and BM300 Pro, side by side in one app. Most monitor apps work with only their own brand. Support for the BM7 / BM300 Pro and the intAct Battery Guard is experimental: built from their documented Bluetooth protocol, and not yet tested on a real monitor.
With Pro, Voltsure also reads Victron Smart solar chargers, shunts, Orion DC-DC and mains chargers, live while it’s open, using each device’s key from VictronConnect. No extra hardware.
Put one on the leisure battery and another on the starter, then add a second van, a caravan or a boat. There’s no limit on how many batteries you add, in Free or Pro. Each one keeps its own name, battery type and alert level, and every connected monitor reads at the same time.
- BM2Battery Monitor and Li Battery Monitor: voltage and history.
- BM6Also sold as the BM200. Adds temperature and the monitor’s own status.
- BM7Also sold as the BM300 Pro. Temperature and status, like the BM6. Experimental: not yet tested on a real monitor.
- RebadgesintAct Battery Guard (experimental), and monitors sold under other brands and names.
- VictronSmart solar chargers, shunts, Orion DC-DC and mains chargers: live readings beside your batteries. Pro.
- No limitAs many monitors as you like, in any mix.
Features
Everything your batteries are telling you
See every battery at a glance, catch problems before they leave you flat, and look back at how your setup is really performing.
Every battery at a glance
Live voltage, an estimate of the charge left, and whether each battery is charging, rising, stable, falling or low.
Alerts before it goes flat
A notification when a battery stays below its alert level for five minutes, even through Focus. Sensible defaults for lead-acid, AGM and lithium (LiFePO4). Alerts work while your iPhone is in Bluetooth range; if a falling battery goes out of range, Voltsure tells you alerts have stopped.
History that catches up
Your monitor logs a reading every two minutes. Voltsure downloads it when it reconnects, so charts fill in after time away.
CarPlay PRO
Check your batteries on the dashboard before you set off, without reaching for your phone.
Widgets PRO
Home Screen and Lock Screen widgets put your battery levels one glance away.
Vehicles & export PRO
Group batteries by vehicle, with number plates, and export your readings as CSV whenever you like.
New in Voltsure 3.8
Your batteries, your solar, your whole setup
Voltsure 3.8 adds the rest of your power system, with Victron Smart devices read live, and puts it all on your dashboard.
Your whole power system PRO
Add solar chargers, shunts, DC-DC and mains chargers beside your batteries, and see how they connect: as a list, an energy-flow map, or a map of your vehicle from above.
Victron Smart devices PRO
Victron Smart solar chargers, shunts, Orion DC-DC and mains chargers show their live readings, with no extra hardware: Voltsure reads what they already broadcast, using each device’s key from VictronConnect.
Every device in one place PRO
A Devices tab with every battery, charger and shunt, grouped by vehicle: van, car, caravan, motorhome or boat.
Solar in, power used PRO
History → Energy shows solar in, energy used and the balance for every day of the week, from your solar charger and shunt.
More on the dashboard PRO
CarPlay lists your Victron devices under their vehicle, after its batteries, with their live readings.
Alerts you can rely on
Low-voltage alerts are Time Sensitive, so they come through Focus, and Voltsure tells you if a falling battery goes out of range.
Honest about the numbers
Clear status, without pretending
These monitors measure voltage, not current. Voltsure is upfront about that: charge is shown as an estimate, labelled “under load” or “settling” when the voltage reads low or high, and the status tells you what the voltage is actually doing.
Open any battery to see its last 24 hours, 7 days or 30 days, with charging periods shaded and your low-voltage alert marked.
- ChargingA charger, alternator or solar is supplying power.
- RisingVoltage has risen over the last two minutes.
- StableVoltage is holding steady.
- FallingSomething is likely drawing power.
- LowBelow the battery’s low-voltage alert level.
Pricing
Free to use. Pro, once.
Everything you need to keep an eye on your batteries is free. Pro unlocks the extras, with one payment and no subscription.
Voltsure
Free
- As many batteries as you like, in any mix of monitors
- Live voltage and status
- Charge estimates
- 24-hour history
- Low-voltage alerts
Voltsure Pro
One-time purchase · Family Sharing
- Everything in Free
- CarPlay
- Home Screen and Lock Screen widgets
- 7 and 30 day history
- Vehicles with number plates
- Power System and Victron devices
- CSV export and themes
Works everywhere you are
iPhone, iPad, Mac and CarPlay
iPhone
Your batteries in your pocket
iPad
Bigger charts, same privacy
Mac
On Apple silicon Macs
CarPlay
Right on your dashboard
Set off knowing your batteries are fine
Voltsure works with BM2, BM6, BM7, BM200 and BM300 Pro Bluetooth battery monitors, as many as you have, and Victron Smart devices.