I bought Zuma last Winter and I really enjoy riding it. I have ridden about 60-70 times this year and have traveled about 750 miles. My problem is I seem to be losing battery range as the Summer progresses. I am averaging around 16-17 mph on my rides which means I am using the pedal assist and also some throttle the keep that pace. In the Spring I could go 18-20 miles and still have some battery left. Now, I am going about 10-12 and the battery goes down to almost nothing. I need to save some battery to go up a 150 foot hill near my house and I hate it when I run out before that as I have some lung problems. My question is this: I have 41.2 volts showing on my multimeter after the battery charges. does that mean the battery is ok and maybe something else? Is there a way to test the battery beyond just taking a reading after it is charged?
Is there perhaps a small backup battery to help get me up that hill in case the main battery goes completely down? Thanks!