Energetic energy padawan
You can use a analog microamp meter with a shunt
Now, that's an idea :·)
Let me see if I get it right. I use a normal 1 milliohm shunt. Current flows both ways through it.
Then I put a resistor (to be calculated) in parallel with that. A - fixed, proportional - percentage of the current flowing through the big shunt will flow through the resistor, right?
So I can use a small diode on that part, which will dissipate almost-nothing, and current there will only flow one way.
I measure micro/milliamps over the resistor/diode, find the right ratio, and call microamps amps.
So when current flows out of the battery, my panel meter shows it. When it flows in, it doesn't.
I wouldn't even have to white-out the μ, as long as I know what they are, it could be saying "apples".
All I need is to see the needle moving :·)