Apex RC Products 2 Pack Lipo Battery Voltage Checker Alarm LED 1-8 Cell 1655

Perfect for keeping an eye an your lipo's voltage. I also use it when I'm flying as a low voltage alarm as it is set able and is loud enough to hear while flying

This is a great tool for knowing when you’re li-po battery voltage is getting low. The alarm does NOT stay on if your voltage dips below the set point momentarily. If your cell voltage comes back up, the beeping stops. Works awesome. I’ve got cars that go into low voltage cutoff way too early so I put the ESC into NiMh mode and use one of these instead. Just ziptie it or use double sided tape to fasten to your chassis and plug in your balance connector to the meter. Set your alarm to 3.4v and you’ll enjoy much more runtime without risking damage to your batteries. So worth the $10 for 2 of these. I’m ordering another pair.

First-off, I know little about this type of item. I purchased 2 of these and big surprise, they both work. These testers seem as if they are very well made, but again, I know little about this type of product. They have a heavy/solid well built feel, and the alarm is quite loud. I have not tried this yet, but the plan was installing one of these testors during flight in hopes of hearing the low battery alarm. As for how they work, I have tested several different types of batteries and the only complaint is that these do not work well when testing the single cell batteries that have smaller connectors. The pin set are spaced for larger connectorsAre they worth the price? Well...yeah, I think so. Happy flying.

So far no problems accurate and they're pretty loud

This is a combination device, it can read the cell voltage of lipo batteries, the final reading showing all combined cell is the most accurate, the horns are loud as they should be, simply cover them with your finger when checking voltage. With the top button, you can set the threshold for the low battery alarm, I set mine at 3.80 per cell to allow a pass or two for landing. Simply attach to your battery prior to flight and the alarm will sound in the sky when it's time to land, it WILL save your battery and aircraft from loss due low battery voltage.

It was nice to get 2 in a pack, but one of them did not work correctly. It was off a bit as I compared it to two other voltage checkers, where all three said one thing, but the forth one, one of these showed a different (less) value that was not accurate. Although, the value was close, it was not accurate so I can't use it confidently, as a reliable voltage checker. However, I can set the voltage it should beep at a little higher than I normally would, and it can work that way. So, it's still useable, as an Alarm, that will sound a little earlier, but that just makes it that much safer. So, all in all, one voltage checker was dead on, and the other was calibrated incorrectly, so it reports a lower voltage than the actual voltage.

Not as loud as other buzzers.

Works well to monitor total and individual cells while RC is in use. I’ve used it in buggies,boats,and planes. Voltage Alarm is great to have especially for boats and planes. Can hear beepers a solid 100 yds plus away on boat or plane giving time to get back before cutoff. I set mine for 1.6 volts per cell particularly in aircraft without telemetry. Only issue I have is mostly on my 4s and 6s jets, the beeper sometimes goes off under full throttle climbs (inrush) as voltage temporarily drops below set value and stays on even though cell voltage returns higher after the inrush burst.