When to Turn Off Battery

Biaviian

New Member
Region
Asia
Google didn't provide much info for thought I have been having... When I arrive to work or home, I shut off the display (Bafang DPC14), the the battery (em3EV 13S 48V-13.6AH). When power is not being drawn from the battery, or the pull is low, its voltage tends to increase slightly. Is the BMS inside the unit assisting this or playing any part? If so, should I not turn off the battery pack right away after a ride, or leave it on for a few...?

Side bar (just though of this) its all over the interweb not to charge a battery right after a ride, but how about the opposite... Is it bad to pull the battery directly from the charger, then go for a ride?
 

JES2020

Active Member
It's fine to turn the battery off after a ride.
The voltage increase you experience is from voltage sag under load, remove the load and the voltage will increase.
Best practice is to let the battery sit for 1/2 hour before charging after a ride, to keep the temp down.
I don't wait after a charge to go riding, (riding after a charge has the added cooling of air flow over the case), I suppose it wouldn't hurt, but I wouldn't be too concerned about it unless you live in Death Valley : )
 

theemartymac

Well-Known Member
Google didn't provide much info for thought I have been having... When I arrive to work or home, I shut off the display (Bafang DPC14), the the battery (em3EV 13S 48V-13.6AH). When power is not being drawn from the battery, or the pull is low, its voltage tends to increase slightly. Is the BMS inside the unit assisting this or playing any part? If so, should I not turn off the battery pack right away after a ride, or leave it on for a few...?

Side bar (just though of this) its all over the interweb not to charge a battery right after a ride, but how about the opposite... Is it bad to pull the battery directly from the charger, then go for a ride?
All things in moderation.

If you have used a fast charger, or just completed an extended total charge from a low state of discharge, the battery is going to be warm inside, and could use a short rest. Excessive heat is always the enemy, and that comes from either rapid charge (from a speed charger) or rapid discharge (from a high demand ride).

But if you have used a typical 3-4amp smart charger and/or just topped up partially before your ride, you will be fine. Most modern 'smart' chargers have a ramp-down setting for the last 10-20%, so they have been slow charging for the last bit of the process and generating less heat anyway.

Anytime you can readily feel the heat through the battery case, you should probably assume the cells are hot and would appreciate a brief rest for the best possible longevity.
 

JES2020

Active Member
All things in moderation.

If you have used a fast charger, or just completed an extended total charge from a low state of discharge, the battery is going to be warm inside, and could use a short rest. Excessive heat is always the enemy, and that comes from either rapid charge (from a speed charger) or rapid discharge (from a high demand ride).

But if you have used a typical 3-4amp smart charger and/or just topped up partially before your ride, you will be fine. Most modern 'smart' chargers have a ramp-down setting for the last 10-20%, so they have been slow charging for the last bit of the process and generating less heat anyway.

Anytime you can readily feel the heat through the battery case, you should probably assume the cells are hot and would appreciate a brief rest for the best possible longevity.
Umm like I said .
 

Biaviian

New Member
Region
Asia
Great info thanks for the responses. Now i just need to get a second charger, one at home, one at work.