# BM6 — user reviews > 72 indexed App Store user reviews of BM6 by Shenzhen Leagend Optoelectronics Co., Ltd., rated 3.20/5 from 17 ratings. - Source: https://appshunter.io/ios/app/bm6/id1561912036/reviews - App overview in markdown: https://appshunter.io/ios/app/bm6/id1561912036.md - Rating breakdown: 5★ 7 · 4★ 1 · 3★ 3 · 2★ 0 · 1★ 6 ## Newest reviews (12 of 72) ### 3/5 — Inaccurate SoC on LifePo4 *2025-12-06* It’s a terrible shame that they don’t have a mode for solar charge units, where SoC just represents where the voltage is on a scale. It ends up showing empty, when the battery is full, and vice verse. Just keep it simple guys, your market is wider than cars and lead acid. ### 3/5 — Werte stimmen nicht *2025-09-27* Kein zuverlässiges tool - batteriespannung beim start 11,2 volt ?! Bei last 12,5, bei motorbremse ohne gas 14,5 volt - da läuft gehörig was falsch ### 2/5 — Keine Funktion mehr seit dem letzten Update *2025-07-27* Lässt sich nicht mehr mit den Bluetooth Devices verbinden? ### 2/5 — Reasonably ok app *2025-07-16, version 2.5.6* The app is ok, it lacks functionality, it definitely needs a way for the user to be able to delete Trips that are not wanted ### 4/5 — 有超溫警示就更好了 *2025-06-22, version 2.5.6* 有超溫警示就更好了 ### 3/5 — 不是有內阻的資訊嗎？ *2025-06-06, version 2.5.6* 買了也沒有內阻，軟體何時會開發，是廣告不實嗎？ ### 3/5 — ちょいちょい日本語（特に漢字）が変だが使える *2025-05-10, version 2.5.4* アプリ自体は安定性も高くて変な動きはしないが、 ・日本語がところどころ変 グラフ画面の右上の切り替えボタンがやたら小さい（iPhone15proMAXで小さくて押しにくいレベルだから、画面が大きくないスマホだとかなり押しにくいはず） ・グラフ画面が強制的に横になる という部分を直してもらえると使いやすくなると思います。 バッテリーモニター自体から送られてくるデータを使って多様な表示をしてくれるあたりは非常に出来が良いアプリなので、あとは使いにくい部分をたまにでいいので改善してもらえたら助かります。 ### 4/5 — CarPlay *2025-04-02, version 2.5.4* Ciao ottima app fatta bene e chiara. Per essere perfetta da 5 stelle vi chiedo di renderla compatibile con carplay in moda da poter vedere dal monitor dell auto il SOC e non dal display dello smartphone. Grazie ### 4/5 — Voltage chart to 20v *2025-03-24, version 2.5.3* 1. Can you develop this app to provide not 16v but 20v charts? 2. When the app displays charts with 16+v diagrams it looks like undervalue graphs ### 3/5 — Cannot automatically calculate fuel prices *2025-02-10* The app functioning well, except the fuel price calculation, even I have input all the details, still 0 price in each trip ### 4/5 — CarPlay request *2024-11-28, version 2.5.2* All good, but can you male a carplay mode? ### 2/5 — Requires login *2024-11-06* This app requires to create a login, but why ?? I see no need for that. So, the app can NOT be used without creating a login. Please remove the login so that I can use the app for the device BM6 which I purchased. ## Most critical reviews (10 lowest-rated) ### 1/5 — Junk *2025-09-15* Batteries don’t connect to app. Verified serial numbers and tried to re-add but never recognizes them. ### 1/5 — Won’t connect to battery monitors *2025-08-17* I have 3 BM2 battery monitors that work fine with the BM2 app (by the same developer) but wanted to use something that could read all of them and export data etc. installed this app but it refuses to even try to connect, just saying “can’t connect to Bluetooth”. I have tried connecting with the BM2 app first (working fine), and tried quitting the BM2 app in case it was clashing in some way but absolutely no joy. There’s an identical looking app called Angel BM200 which doesn’t work either. I know they work as I can see them from the BM2 app but can’t get this to work at all. ### 1/5 — Rubbish *2025-04-10* Unless you want to give them access to your Apple account you can’t even create an account. ### 1/5 — Could be so much better *2025-01-19* Main display shows SOC (how much charge is left in the battery), but vehicle starts faultlessly when it’s showing just 8%, after only a week & voltage is showing 12.3v. Maybe SOC better for electric vehicles not a lead acid battery! Also better if the main display could be changed to show voltage. Bluetooth range VERY limited….. approx. 2m. Guess to me the value of this product would be just £5.00 - no more ### 1/5 — BM6 *2024-12-20* Crashed after two days ### 1/5 — Application not working *2024-10-31* The application is not working can not connect to my account ### 1/5 — Application not working *2024-09-27* The application is not working can not connect to my account ### 1/5 — Poor app *2024-09-03* I have bought the sensor and download the application three weeks ago last couple of days. The application doesn’t want to connect to the sensor and keep broken and showing information that request. Please try again later so the developer please check the application and do something withit . Regard regard, unhappy customer. ### 1/5 — Não consigo fazer login. *2024-08-13, version 2.5.0* toda vez que tento aparece a mensagem “Operação falhou, por favor, tente novamente” ### 1/5 — Not connected *2024-06-10* Always not connected Bluetooth even disconnect the battery & reconnect is same problem ## Most praised reviews (10 highest-rated) ### 5/5 — Useful info. *2026-05-18* Had 2 of these for a few years on my personal van/leisure batteries, just put a third on my work van as the stop start is intermittently turning off, it paired up easily when I tapped the + symbol in a blank battery display so now I can see how its doing and replace it if required. Not something you replace unless required these days. ### 5/5 — Awesome BUT ADD CAR PLAY *2026-04-15* It monitors the battery pretty accurately and also keeps track of the trip and values of the battery during the trip and it’s extremely useful also having it give you warnings about low voltage and having the ability to test the battery with easy to follow directions are also a plus BUT PLEASE ADD IT SO I CAN POP IT UP ON MY APPLE CROLAY SO I DONT HAVE TO LOOK AT MY PHONE WHILE PARKED :) thanks ### 5/5 — Tracking *2026-03-19* I love this battery monitor it does more then just tell me my battery health it tracks my drives, i have this in my sand rail and after 7 days in Glamis i noticed i had a clear map of all our drives and the location of the car i couldn’t be happier I’m going to get more for my other cars ### 5/5 — Works well *2025-09-29* Requires a Login but you don’t need to create an account or share your email. I just use my Apple ID. ### 5/5 — 電壓不太準 *2025-07-05, version 2.5.6* 藍芽電錶顯示12.6v,但實際電壓只有12.1v 若app能提供微調電壓更好！目前使用上除了電壓不準其他都可以接受！不知道有沒有防水！ ### 5/5 — Great bit of kit and app *2025-03-28* Fantastic app for monitoring battery voltage, capacity and also intelligent charging systems. Most modern vehicles don’t charge unless they have to, so diagnosing a faulty alternator can be tricky, with prolonged data it’s much easier to monitor and confirm correct charging systems operation. ### 5/5 — Great little device *2025-02-02* Works as described, though fuel records seem off 7 8.0 l/100 at $1.63 =$323 for 30kms ? GPS QUITE Accurate and very impressive ### 5/5 — F type jag *2025-01-09* Brilliant app… sits on my F type… does exactly what I expect it to do … nice to see what’s going on, ### 5/5 — Super Produkt *2024-10-28* App läuft fix und war in Sekunden eingerichtet. Super Produkt. ### 5/5 — LiFePO4. SOC not accurate, Fix *2024-07-18* The state of charge for my battery displayed 2 to 3% when fully charged. To fix this: tap in the upper left: three lines icon, tap the: serial number text, tap: custom battery. Adjust the data below to the manufacturers numbers by pressing plus or minus. Press and hold to: quickly advance the number. Once done: click OK. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-18.*