Just checked the link and it is broken try
https://www.componentshop.co.uk/

Apologies
Dave

Hi Bill
Doug has shown a battery checker and alarm.
You can get battery checkers see
https://www.componentshop.co.uk/led-battery-status-indicator-for-2s-to-4s-7-4-14-8v.html.

If you are going down the LiPo route I suggest you make sure the ESC you buy has a built in circuit which reduces the current should the battery volts drop below the set voltage (3.3v is common).

In my experience the alarms although they work well are not loud enough to be heard, if your model is not near, and they do not cut or reduce the current, leaving your battery at risk of over discharging.

Good luck with your model

Hi Both, so do I saga, and here's what they look like folks!😉
To answer your actual question Andy; you can only 'set up' the alarm voltage; range 2.7 to 3.8V depending on Lixx type, or OFF.
As saga says they are preset to 3.3V.
Setting up as such is done by repeatedly pressing the little (and I MEAN itsy bitsy teeny weeny😉!) button at the opposite end from the pins.
With the display face up and the pins facing you ground (black) is on the far left; as in attached pics of the device in action.
If I'm just doing a quick bench check I set the alarm to OFF to stop the ear splitting PEEEP 😡 For use in the boat I leave it on set at 3.3V for LiPos.
Hope this helps, cheers Doug 😎

Hi Andy, I use a little combined Voltage and Alarm like this from HobbyKing https://hobbyking.com/en_us/hobbykingtm-lipo-voltage-checker-2s-8s.html
Or you will find them on eBay from China if you don't mind waiting
There is usually information and instructions on the back and the alarm is usually set for 3.3v per cell when it arrives.
A useful reminder when sailing, I would rely on my ESC settings when using a brushless setup.
Wes.

Hi Andy
I use the Hobbyking Low Voltage Alarm(black) part no. Alarm-Voltage.
These monitor the total voltage and each cell voltage with a digital read out.
The connector from the battery, the black wire is to the left looking at the front.
Banggood have one without the black which does the same job.

Hi Andy
There are many variations on the market but they all work basically the same way.
Most modern Lipo ( and all Lithium based batteries) come with a small white plug with multiple contacts as well as the main power plug, usually connected to some heavy duty wires.

The plug is connected to the battery negative at one end and then each pin is connected to the negative on the next battery etc.

This allows the individual cell voltages to be measured.

The monitors do this automatically when connected to the plug the correct way, if it doesn't light up it's probably the wrong way round. in my experience the monitor connector is not marked so you may need to try different combinations to find the correct way. You will not damage anything if you get it wrong.

When correctly connected the monitor will display each cell voltage then the total voltage. This usually repeats after a few secs until you disconnect

If you have a charger they have a selection of different size sockets for the number of pins and can only be inserted the correct way. You will need the manual that came with the charger to select the correct screen to display the values, but most can be found if you Google.

Glad to hear you have a monitor, LiPos can be damaged if not kept balanced, or discharged below 3v ( some are higher, usually the high power versions)

Hope his helps