Battery-Guard Bluetooth Voltage Display for Starter Batteries

Purchased this device to keep a watch on a car that is not used all the time during the winter months. Easy to attached to car battery and after downloading the app from the App Store and turning on the iPhones bluetooth it would not connect to the device despite showing in Bluetooth Devices on the phone. Deleted the app on the iPhone and downloaded again from the store, this time the device paired with the phone and gave a reading straight away. If you do purchase this device I would recommend attaching to the car/bike battery first then download the app to connect to the device.The instructions with the device are in English, the app is also in English but some prompts still appear to be in German eg when changing setting re naming the battery.To check the status of the battery I now only need to open the app when close to the car, let the device connect via Bluetooth and get a reading on the voltage, the app will also show when the battery will need charging or car needs to go for a long run on a nice dry winters day.

Easy to use, simple to install (just + and - wires) works very well. Got it on a defender that sits from time to time, allows me to monitor the resting battery level from outside the vehicle without unlocking the doors and energising the ECU.

Have seen an endless sea of Chinese 'no name' products but all looking similar, with names such as 'BL2' some of which seem to feature (legit?) homologation marks, some not.This however looks and feels like a legitimate item and the fact the app seems Taiwanese origin, not Chinese, is encouraging. It also doesn't ask for personal details (but does ask for GPS to be turned on). The wires also seem good quality, some of the others looked like bits of cheap speaker wire.The units look and feel solid. I have bought one for a caravan, and one for my car. It is a bit annoying that this seems squarely aimed at 'cars' and there is no simple config to, for example, turn off 'trips' and 'cranking' logging for a static battery. But the voltage data seems accurate as is the charging detection. Lets hope it lasts long-term!

As always you can't assess how long something will last when you've just bought it, but initial impression is of a robust, well designed product with very good software. I bought it to monitor the battery state of a Hyundai Kona EV. Hyundai EVs are known for problems with their old-tech 12V batteries, namely not being charged by the traction battery and leaving the vehicle dead. This unit's app has a 'trips' feature designed for ICE cars that records when the engine was running. On my car it shows when the battery is charged, typically for 20 minutes every few hours, as well as the state of charge (SoC). Bluetooth connection is good enough to work when I'm in the house and the car is just outside.

Bluetooth reach is good - I was on the first floor of my house and my iphone could connect to the car in my driveway. Very easy to install, good connectors. However, the alternator didnt charge the battery to the full 14.7V when the device was connected (only 12-13V), nor did the tests in the app work with the device saying the engine wasnt started (even though it was)... so I would say this is risky to use as it is more likely to drain your battery than be useful.

Seems to be quite accurate, not bang on, but to a -00.2Which is close enough.Works perfectly.Nice to view the voltage of your battery, without taking panels offTo check with a multimeter.Good pice of kit for the price.Its like having your battery's health in your pocket.

This unit does exactly what it says on the tin. I installed one in my camper van so that I could monitor the leisure battery. It’s let down by a limited Bluetooth range. The app will only connect when standing right outside the van or in the van of course. So my expectations of being able to remotely monitor the battery from inside the house were dashed. The user manual is in German, an English one can be found on the vendors website but took some searching.

I have these for my leisure batteries (2 of) and they connected quickly and simply. A must have if you want to keep a constant eye on your batter status

Das hätte ich zu diesem Preis nicht erwartet. Sehr geringe Stromaufnahme absolut perfekte und verständliche User App und Gerät Installation. !!Werde mir ein zweites Gerät bestellen.Nicht nur für Wohnmobil Fahrer die ihre Batterien überwachen wollen (müssen) ein absolutes MUSS.Absolute KAUFEMPFEHLUNG!MfG G.H

works great!

Perfecto para tener controlado el consumo de la batería de mi autocaravana, Lo he instalado en la batería de motor y así poder comprobar su funcionamiento. Puedes programar avisos cuando legas a un tanto porciento. además te da información de la duración de tus viajes

Utiliser pour une batterie de remorque basculante , très efficace

For only 20 euro, you get a lot of information about the state of your battery, the voltage, the voltage regulator etc etc.I'm currently searching for the cause of some battery drain, so all information is valuable to me.