CAMWAY 5PCS 2in1 1-8s Lipo Battery Voltage Tester,RC Low Voltage Buzzer Alarm,Battery Monitor Checker Tester for 1-8s Lipo/Li-ion/LiMn/Li-Fe

Very happy with product. Works just like it says. Should have bought these a lone time ago. A must have for RC pilots.

Instruction sheet was too small to read! You tube video helps.. .. Great price. All of them worked.

The media could not be loaded. I pay $13 USD for a five pack of them at a time, delivered, and I hand them out like candy to my RC buddies. They are so easy and quick and effective to check your battery condition that your batteries are always perfectly understood and very easily managed. And the alarm too is awesome and takes all the guesswork out of when to stop flying. The siren low voltage alarm is easy to hear from your plane or boat or truck etc. Its high tech and super easy to use, and very well made, and works perfectly. I first saw them on RC SAYLORS on youtube, they're crazy about them, and they know what's what.

I purchased these monitors for my Bebop 2 quadcopter battery charger. The original charger failed so I purchased a generic LiPo charger from Amazon (basic 2 wire connection). I was hoping I could use the monitor standalone - connect negative to negative, and positive to 3S (3 cells) and get a readout on the overall health - no go, the readouts were erratic at best. I guess that's what I deserve for trying to use them for an application for which they were not intended. I disassembled my LiPo battery and derived the pinout of the connector. After correctly connecting each battery tap, the monitor worked as expected - showed voltage for each battery in sequence, then displayed the total voltage. As many have pointed out, the low voltage alarm is quite loud (read annoying) but luckily can be disabled via the push button (unfortunately it still beeps a few times on power-up). Overall these work as advertised and I'm satisfied with the operation. It would have been good to have a little more connection info in the description.As for accuracy, I compared the voltages read from the monitor to those from a digital oscilloscope against 2 batteries.BATTERY1 (2yrs) BATTERY2 (new)Monitor Scope Monitor Scope4.24 3.82 4.15 4.203.96 4.02 4.12 4.004.26 4.36 4.20 4.4012.4 12.20 12.4 12.60Measurements were taken the same way - 3 taps to the monitor, and 3 probes to the scope (probe for cell 1, probe 2 - cell 1, and probe 3 - probe 2). So there might be some discrepancy due to the way the monitor subtracts values (or my math on the scope). At any rate, the monitor voltages are close. If anyone knows how to do the math to compensate for the internal resistance, series voltage addition, and loads - feel free to add comments.Final thoughts - make sure you hook up the cell taps or the monitor will not work properly.

I bought these battery testers after seeing them featured on a YouTube video by the TheRcSaylors. That video showed how they work and explained how they can save you much money by being able to monitor your LiPo batteries quickly and accurately. I've been using mine on several batteries since getting them. They are easy to use and do their intended job. They are small and don't weigh much at all, so can be used in a RC plane to tell when the battery is approaching the low voltage range that could damage the battery. The warning sound is quite loud, and will do the job. I highly recommend these little devices.

These work as described same functionality as the expensive ones

Works great in my SCX-24 Jeep, hard to fit under the shell of a Deadbolt. I just put it under the velcro right on top of the battery and I can see the voltage through the windows. Test it for your use conditions. Set it higher than you think, and then time how long it takes to fully drain the battery after it starts beeping. I set mine so I have about 15 minutes of crawl time left, which is usually 3.4 or 3.5 volts. Once it beeps I know I can swap the battery and not have to worry about charging it immediately without damaging the battery if it's going to be a while before I'm back home.These things are LOUD! Probably great for a plane or a boat that gets pretty far away from you, but for a crawler that's always within 20 feet or so, they are ridiculously loud. I ended up trimming some ear plugs and shoving them in the speakers and I can still hear it across my yard.

Great product and value,does as advertised