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The battery should charge a minimum of 12 hours. After charging the battery, unplug the charger and
check the battery voltage using a multimeter. If the battery voltage has increased but not reached 12V it
may need to be left on the charger longer. If the battery voltage has not changed, replace the battery. Oth-
erwise disconnect the charger from the battery and reconnect the datalogger to the battery.
Appendix D
