When your batteries get old they lose their ability to maintain a full charge and going up an incline with weak or older batteries will result in a larger current draw and thus lower your batteries charge. I have noticed the clicking sound you are referring to on a few different models when the batteries get excessively low. I haven't found anyone that can tell me if its due to a weak motor, malfunctioning electo-brake or low batts. but it does go away with fully charged new batteries on flat ground.
Your battery does not lose charge when going up hill. The motor needs more power to get you up the hill, thus the power meter reads this as a voltage drop.
Hi, Something maybe touching the battery terminal and arcing is occuring. Check terminals again.
You may have to strap down the battery better. Good luck
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