Comparison

123SmartBMS vs KG Serials

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

123SmartBMS

This app monitors and manages lithium battery packs, ensuring optimal condition and extended lifespan. It tracks cell voltages, temperatures, and currents, while balancing cells during charging. Connect via Bluetooth to view real-time battery status and control charging/discharging.

Highlights
  • Monitors cell voltages and temperatures
  • Tracks in- and outgoing currents
  • Balances cells during charging
  • Bluetooth connectivity for real-time data
  • Controls charge/discharge signals
  • Extends battery pack lifespan
Features
Read full description

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 system measures important data like cell voltages, cell temperatures and in- and outgoing currents. It also balances all cells to the same voltage during charging. The BMS supervises the whole battery pack and has two signal relays to indicate “allow to charge” and “allow to discharge”. These signal relays can control chargers and inverters with “enable”/”disable” signals or by connecting an energy efficient power relay to the signal relay. An example is the 123\SmartRelay. Easily connect your phone to the BMS using Bluetooth to see relevant information including state of charge, energy consumed, energy stored, in- and outgoing current, cell voltages and temperatures. With 123\SmartBMS, your battery pack is in safe hands.

About

KG Serials

This utility measures electrical parameters like voltage, current, and power. It offers multiple protection functions and real-time battery monitoring on a color LCD. The app also supports data export and remote control via mobile or PC.

Highlights
  • Measures voltage, current, power, capacity
  • Multiple protection functions (over/under voltage, over current)
  • Real-time battery monitoring
  • Color LCD display
  • Voltage and current curve display
  • Mobile app and PC control
  • Firmware updates
Features
Read full description

The VAG series volt-ampere meter is a new type of coulomb counter that can measure various physical parameters such as voltage, current, power, charge and discharge capacity, watt-hours, time, etc. It can also set parameters to realize multiple protection functions such as over voltage protection, under voltage protection, over current protection, overpower protection, over temperature protection and time limit protection.The meter can automatically identify the direction of the current, and can monitor the battery capacity in real time and display the measured data in use color LCD screen. The VAG series voltage and current meters add voltage and current curve display and export functions on the basis of the original functions. At the same time, the mobile phone APP and host computer can be used to control, and the firmware can also be updated and upgraded in real time.

Screenshots

123SmartBMS4 screens
KG Serials4 screens

Verdict

The call

The clearest difference is review sentiment: 123SmartBMS at 67% against KG Serials's 0%. 123SmartBMS also leads on rating (4.5 vs 3.4) and ratings volume (21 vs 7). KG Serials's advantage is iOS requirement (9.0 vs 16.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

123SmartBMS holds the better App Store score, 4.5 against 3.4. Both are backed by a comparable volume of ratings — 21 and 7 respectively. Written reviews point the same way: 67% of 123SmartBMS's written reviews are positive against 0% of KG Serials's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly monthly. Both last shipped on October 7, 2026.

Scorecard4 real differences · 6 level
123SmartBMS versus KG Serials: the parameters behind the verdict, then further details
Parameter123SmartBMSKG Serials
PriceFreeFree
Rating4.5 (21 ratings) — better3.4 (7 ratings)
Positive reviews66.7% of reviews — better0.0% of reviews
Number of ratings21 — better7
Update frequencyMonthlyMonthly
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.09.0 — better
Further details — not scored
Size190 MB30 MB
Age rating4+4+
DeveloperAlbertronic B.V.Hangzhou Junce Instruments Co., Ltd.

Customer experience

123SmartBMS

All ratings21 ratings
Positive85.7%
Neutral4.8%
Negative9.5%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

KG Serials

All ratings7 ratings
Positive57.1%
Neutral0.0%
Negative42.9%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

In-app purchases

None

123SmartBMS

No in-app purchases

None

KG Serials

No in-app purchases

Questions

Is 123SmartBMS free?
123SmartBMS is free to download, with no in-app purchases.
Is KG Serials free?
KG Serials is free to download, with no in-app purchases.
Which has better reviews, 123SmartBMS or KG Serials?
123SmartBMS is rated higher. 123SmartBMS averages 4.5 out of 5 from 21 ratings, while KG Serials averages 3.4 from 7 ratings.
Do 123SmartBMS or KG Serials have ads?
Neither 123SmartBMS nor KG Serials shows ads.
Which is updated more often, 123SmartBMS or KG Serials?
123SmartBMS ships an update monthly, and KG Serials monthly. Most recently, 123SmartBMS was updated on October 7, 2026 and KG Serials on October 7, 2026.

Other comparisons