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Charge your Battery right

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There is no harm leaving a charger connected to the wall so long as it is not connected to a battery.  Leaving it connected to a battery is unsafe.

There are plenty of good reasons for not leaving a charger connected to a battery.  Not the least of which is the fact that doing so assumes everything will continue to work properly.  Stuff breaks, and if this stuff breaks, fires and explosions inside your house can result.

For example, if a charger that is supposed to cut off at a certain voltage and doesn't.  At that point the Battery Management System is the last line of defense to turn the incoming current away (so to speak).  If that fails - and BMS' do fail - you have an explosion and fire if the battery and charger are left alone long enough.

I have personally caught a charger in the midst of just such a failure.  Luckily I checked on it and suffered only the inconvenience of a warranty return.  This *highly experienced* ebiker was not so lucky and lost part of his house:

https://endless-sphere.com/forums/viewtopic.php?t=87975

An added line of defense is a cutoff timer.  Best are the mechanical/analog variety, but any countdown timer is better than none.  Luna Cycle started selling these not too long ago. 

https://lunacycle.com/timer-to-auto-shut-off-ebike-charger/

You can get that same timer for a lot less on Amazon :-).  

Edited by MattRobertson

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