ANCEL BM300Pro Bluetooth Battery Monitor for 6V, 12V and 24V Systems

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Product guide

ANCEL BM300Pro Bluetooth Battery Monitor for 6V, 12V and 24V Systems

ANCEL BM300Pro is a Bluetooth battery monitor listed for 6V, 12V and 24V systems. It is designed to display battery information through a smartphone app, with the listing also describing multi-battery tracking and historical data. Note that 6V monitoring is limited to voltage and estimated state of charge.

At a glance

The listing describes app monitoring of voltage, estimated state of charge and temperature, plus cranking and charging checks and trip history.
The manufacturer claims monitoring for up to four batteries, with alerts for voltage drops, charging issues and weak cranking.
The listing describes 72-day history and trend data for reviewing changes over time.
The stated 6V limitation is voltage and state-of-charge monitoring only.

Price

$47.49Save 21%

Reference price: ~~$59.99~~

Price checked: Nov 14, 2026

View offer

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Pros and cons

Pros

Covers listed 6V, 12V and 24V systems, making it relevant to mixed vehicle or marine setups.
App-based readings and historical trends can help track battery behavior over time rather than relying on a single reading.
The listing claims support for up to four batteries, which may suit multi-battery RVs and boats.

Cons

Bluetooth access depends on a compatible smartphone and the app, rather than a described standalone display.

Technical specifications

12 specifications

Identity
Brand	ANCEL
Model	BM300Pro
Measurement type	Voltmeter
Compatible device	smartphone

Voltage and power
Listed system range	6V, 12V and 24V
Minimum operating voltage	6 volts
Maximum operating voltage	24 volts
Power configuration	Battery Powered

Features and construction
Ingress protection rating listed	IP 67
Upper temperature rating	85 °C
Color	Orange

Dimensions
Dimensions listed	4.33 x 0.98 x 5.12 inches

What to know before buying

Listing details to confirm

The listing has inconsistent descriptions of the monitor’s readings: the item highlight mentions estimated state of charge and temperature, while other descriptions emphasize voltage and cranking or charging tests. It also describes 6V monitoring as voltage and state of charge only, so confirm the exact readings and test functions supported for the intended system before buying.

What’s in the box

Included

Battery monitor

Who is it for?

A good fit for

Owners monitoring 6V, 12V or 24V batteries who want app-based readings.
RV, boat or vehicle owners who may benefit from the claimed four-battery tracking and alerts.
Buyers interested in reviewing battery trends and history over time.

Less suited to

Buyers who need a monitor with a built-in screen or do not want to use a smartphone app.
Anyone needing the full feature set on a 6V battery, since the listing limits 6V to voltage and state-of-charge monitoring.

ANCEL BM300Pro Bluetooth Battery Monitor for 6V, 12V and 24V Systems · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 1,242 ratings

5 stars67%67%
4 stars15%15%
3 stars6%6%
2 stars4%4%
1 star8%8%

Customer feedback describes useful battery monitoring and accurate voltage readings, including for cars and boats. Reports about Bluetooth connection, app functionality, value and battery readings are mixed. That matters because this model relies on app-based access and its main appeal is ongoing tracking rather than a standalone display. Aggregate ratings lean positive overall but do not establish why individual customers rated it as they did.

Positive themes

Customers describe the monitor as useful for battery monitoring and report accurate voltage readings.

Mixed feedback

Bluetooth connectivity receives both positive reports of quick connection and complaints about connection problems.
App functionality and value receive mixed reactions.
Battery monitoring feedback is mixed, with some reports of frequent low readings.

Frequently asked questions

What voltage systems does the ANCEL BM300Pro support?

The listing names 6V, 12V and 24V systems. It specifies that 6V use supports voltage and state-of-charge monitoring only.

Can it monitor more than one battery?

The manufacturer claims it can track up to four batteries. Confirm how the selected setup handles multiple batteries and which components are supplied.

What information does the app display?

The listing describes voltage, estimated state of charge, temperature, cranking and charging information, alerts and historical data. Descriptions differ on the exact readings and tests, so check compatibility with your intended battery and system.

Does the package include the monitor?

The supplied components list names one battery monitor. It does not specify additional accessories.