Funny you should ask this just now Eric,
I recently ran across this little fella on HobbyKing EU (Holland warehouse😉) and mine just arrived today😊
They call it a Watt Meter but it isn't really.
It measures current and voltage, records the values and includes a settable low voltage buzzer alarm, which is just what you want right?
One of the reviews on the HK site attached below.
I agree with him about the Chinglish menus but it's intuitive anyway.
He's wrong though that the current / voltage curves are not recorded.
He just hasn't found it yet. I just ran across a curve browsing mode for this😉
Others report that they found it useful for sizing props and ESCs👍
Will report further when I've thoroughly tested it.
Cheers, Doug 😎
"No more guess work when it comes to measuring current draw.
This nifty device has pre-installed XT60 connectors, which is convenient if you are already using XT60's. However, it also comes with a couple Traxxas T connector adapters in the box.
Can read current amps and peak amps, as well as min voltage.
Has voltage meter so you can plug your LiPo balance plug into it and read each individual cell voltage.
Also has a low voltage alarm with configurable min voltage settings.
Has a live line graph that looks like a heartbeat monitor. You can see the line jump up when there is a spike in current. Unfortunately i don't think there is a way to record the line graph, so you have to keep watching it live. It does however record peak current and min voltage.
I could have gotten a lower rated ESC for my motors if I knew how little current the motors draw. This thing could save you money in that regard.
Has a couple weird chinglish menu entries"