123\SmartBMS

3.4
264 reviews
10K+
Downloads
Content rating
Everyone
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About this app

123\SmartBMS is an easy to use yet advanced, modular BMS to keep your lithium batteries in perfect condition, increasing the lifespan of the battery pack.

The BMS measures important data like cell voltages, cell temperatures and in- and outgoing currents with the two included high accuracy, dual range current sensors. By measuring both currents independently, it is possible to know the current production and consumption. The system balances all cells to the same voltage during charging.

Two integrated signal relays with potential free contacts can be used to switch enable/disable signals or power relays to control the power to chargers/solar regulators and/or inverters.

Easily connect your phone to the BMS to see relevant information including state of charge, energy consumed, energy stored, in- and outgoing current, cell voltages, cell temperatures, SoC history of the last week and error history.

For simulator mode: the PIN is 1234
Updated on
Jan 29, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection

Ratings and reviews

3.1
232 reviews
Delboy Webster
February 15, 2026
Rubbish. it only connects about 1 time in 20 tries. mostly stuck on "reading state ..." screen. Now have to disconnect Out board from battery each time I need to connect
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Albertronic B.V.
February 16, 2026
Hi Delboy, It sounds like you have a gen1 or gen2 123\SmartBMS (from before 2019). Please ensure that you have dipswitch 1 on the IN Board set to OFF. This significantly decreases chances of a crashing Bluetooth module.
Florian Girard
July 21, 2023
I've been using this app & bns for a long time. The gen 3 is great it works well and is reliable, I would not have any reproach to say (perhaps the sensors) I put only one and it would be pretty to still see how much you charge or discharge (even if it's less precise than with 2 sensors). You can even plug the bms to Victron 👍🏻 The app is also improving a lot lately I love it !
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A Google user
October 6, 2018
The 123SmartBMS are easy to use and in general a very good product. However the current shunt is not sensitive enough <1A and if I leave the boat for several weeks the system drains slowly but the BMS don't detect this and still display 100%. The battery was close to empty... it would be good to be able to set the "start charging" parameter after ether time (like every 100h) or a minimum voltage on the complete pack. Please make an update for this to get a 5 star.
6 people found this review helpful
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What’s new

Minor improvements

App support

About the developer
Albertronic B.V.
app@albertronic.com
Zuidbaan 510 2841 MD Moordrecht Netherlands
+31 182 611 272