Digital Car Voltmeter 12V ~ 24V – LED Display Battery Voltage Tester, Plug into Cigarette Lighter Socket, Portable Auto Battery Monitor for Cars, Trucks & SUVs

Had a flat battery in November 2022 due to the -8c weather, got the car jump started, taken it for battery test at local garage, they couldn't tell if the battery was recovering or not so failed the test but told me to drive the car to see if it would charge up and re-test it, I took it back to the garage they are saying it no longer shows as failed but charge and re-test,, it's getting tricky to determine if the battery is recovering especially with the winter we are having and the cold snaps and it being xmas and the car sitting on the drive. so I saw this item, which is fantastic, so small, clear display and it is showing the problem I have with the battery and that by driving about I am getting some improvements in charge and i'm able to track those improvements. Before I did this video, Car switched off , shows 11.7v, |I drove about 11 miles to Asda, tested it and it was 11.9v, went round the shop for 1 hour and half, retested in the car park before switching on the car, video is shot in rugby Asda car park. Got home, 12.1v, with engine switched off, so there is hope if I take it for another few spins. A new car AGM battery for Skoda Octavia 2017 models costs a whopping £358! so I'm doing all the testing I can to see if I can avoid replacing a battery which is just over 5 years old. What I like about this device it shows you clearly in digital form the voltage, and if you have the engine on you can see if your alternator is working as it should show this from 13v to 14.8v. Such an inexpensive useful item, don't need to get the hood open and a meter plugged in or use one of those devices that just shows lights, this is showing me exactly what I need to know. I have a blackvue magic pro / dashcam in the car which is designed to keep the cam powered when the engine is off until the voltage drops below and certain level and I can verify this is all happening while watching the this unit's display. Must buy for anycar!, answers questions like does my cigarette lighter stayed powered when the car is off, answer for mine is yes it does, so don't leave it plugged in when the engine is off and forget about it!.

Bought this to monitor my 12v Battery in my Toyota Hybrid. Plugged into the accessory socket with the Hybrid system off but accessory mode on and it gave an instant and clear read out of the 12v battery voltage. Also when the hybrid system was turned it showed the increase in voltage as the system began charging the 12 v battery from the car drive battery. a simple easy way to monitor the health of the 12v battery and see that the charging system is working. Great for the price.

Great Product, very good value, easy to use. I was lucky to receive package as it was just dropped in the driveway.

Well made and simple just keep in y the cigarette lighter (if it is only live when engine running) and you will see when the battery needs charging

So easy, gives me an idea of volts when car has been stood for at least 5 hrs straight plug in to socket, It shows if battery is being charged

Good little voltmeter, doesn’t take up much room when not being used. Was delivered on time and is as described. Pleased with the purchase.

i bought this as car was nit starting after a couple of days,i suspected the battery was no good,this tester proved this,as it showed the charge was ok when car was running but the battery would not hold charge if left,so i bought a new battery,this tester’s proved its worth again as new battery was charging as it should but the car was overcharging it when running,proving new battery had to be coded to the car,once done all good,its so easy to use just plug into lighter socket,no need to lift bonnet and use conventional tester,can also leave in when car running so can check alternator is working ok,for the price worth buying

For what is it, it works and its okay, I've checked it vs a multimeter and it's about -ve 0.3v under (meter reading 12.5v, this reading 12.2/12.3v) - but I wonder if part of this is voltage drop from the battery to the plug. So if you are getting it for accuarcy then be advised, but also for £6 it's what I'd expect - overall okay of kit and if anything the low voltage reading can act as a safety margin so you don't drain your battery too much.