At What Voltage Is A 3 Volt Battery Dead. For example here is a profile of the voltage for a classic 37V42V battery. Open voltage at 68 F 20 C.
In the case of a 15V this corresponds to 08V and for a 9V battery about 54V. Fully charged - 42V fully discharged - 26V - 28V. If the voltage bounces right back to 3V the battery is healthy but if takes more than a half-second to come back up its not reliable.
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As we can see its nominal voltage is 36v so basically it should behave the same or very similarly to a 37v battery 18650 for example. The typical 12 volt marine battery is composed of 6-22 volt cells hooked in series. The voltage starts at 42 maximum and quickly drops down to about 37V for the majority of the battery life. The power rating of the resistor needs to be more than the current through the resistor times the voltage across it.
