Battery charge checker

[terryj]

I think I read on this forum that there was a battery checker that you put into your jack socket,  or am I dreaming again???

[TimR]

Many many years ago...

 

http://www.thomann.de/gb/keith_mcmillen_batt_o_meter.htm

 

[tauzero]

The Keith McMillen Batt-O-Meter works very well, with the proviso that you can't check an 18V preamp by plugging in to the jack socket, you need to take the batteries out and test them individually.

[Sparky Mark]

Deleted. Didn't read the first post correctly. Doh!

 

Edited November 27, 2025 by Sparky Mark

[ead]

I was really hoping that a batt-o-meter measured something completely different 😞 

[Hacksawbob]

I was thinking of DIY building something along these lines for myself. I have an acoustic that I have to detune the strings to access the battery. I have a trs cable and a multimeter to check it, but it's less than optimal!  If it works out ok I will post on here. 

[itu]

A DMM sure tells something about the batteries. True battery testers usually have some kind of load which gives better understanding of the capacity.