Discharge E-Bike Battery For Perfect Storage Voltage Lectric XP

Lithium e-bike batteries like to have a resting voltage at 50% capacity to help prolong the life of the cells. Here is a cheap idea on how you can discharge the pack to a set voltage. You can find the part on amazon or on the web. Everything listed below was about $30.00 This was made for my Lectric XP bikes.
This project was made for a 48v battery pack
WSDMAVIS YX-20A Cut Off amzn.to/3fhnRIP affiliate link
7W LED Light Bulbs amzn.to/3HYURmf affiliate link
Lamp Socket amzn.to/3CfdzDh affiliate link
Warning:
I am not responsible for any damage or bodily harm that may occur from making the device shown in this video.
This video is made for educational purposes only

[@user-br4ex1jl7k]

Thanks. Why not just use at 60+ watt incandescent? Only need 1 lamp holder. Will use your design to make a smart charger as well utilizing stock charger. Thinking another 30 bucks max. If there is interest I will post the schematic

[@secureguard673]

thank you very much

[@asaymike]

I use an electric dryer with several speeds. For a 1675 W dryer (about 15 amp at 120V), high draws about 6 amps for 52V ebike battery, medium about 3 amps and low about 1.5 amps. This way you can adjust the speed with which you drain the battery. Same set as here, but use a simple wall plug instead of light sockets and bulbs

[@envikka]

do you have a picture for this? id like to do how you did it. thanks

[@raczyk]

So for storage what is ideal 40 to 60% charge?

[@johnbarbary3938]

Rick, thanks for great video. I think I watched it 6 times just trying to get the display on the regulator to light up. I had the company send me a second regulator and same results. No Display no light bulbs lit. I can measure with a meter, the voltage on the small screws you tighten to lock in the wire. Yes polarity is correct and the input wires are on the input. Help???

[@Ricks_Tech_Talk]

If you are on face book send me a picture or video of how you have it hooked up on the back facebook.com/RicksTechTalk/

[@RPMac]

Oy !.... just dont store your battery too long at low or high charge....left mine almost six months at half charge and the still work beautifully...3 years now.

[@raczyk]

I've left my ebike battery charged for to 90% for about 4 months. Now I'm disccharging it for storage, because I know better. Anyone know how much damage to the cells occured when storing it at a high charge?

[@yone2002]

You definitely can use 120v incandescent bulbs to speed up the discharge process. Your battery pack can handle 10A discharge current easily. One 100w bulb yields less than 1A current. Last time when I discharged my 24V battery pack to test the battery capacity, I connected two electric space heaters, 1500w each, in parallel to get roughly 5A. Since your battery is 48V, so you only need one heater to get to 5A. You can also switch between 900w (medium) and 600w (low) selections on the heater to reduce the current. All these incandescent bulbs and space heaters are just high power resistors which can dissipate energy into heat.

[@williamfaulkner7581]

I left my battery in my XP step-over eBike too long (4 months) without recharging and it now reads 29 volts. My std lectric charger no longer detects the battery (led always green) and the battery does not have enough voltage to power the control display. Is there a different charger or another device/process that might make my battery useful again? Lectric support advised me to order a new replacement battery for $299 and recycle the old one. 😢

[@Ricks_Tech_Talk]

When I built battery packs and came across 18650 cells that would not charge I would zap them with a fully charged battery for 5 secs. To do that its just pos to pos and neg to neg for a few secs. After that the battery would show enough voltage for the charger to kick in. Not saying this would work and its risky in some ways. But I would take a 48v dc source like 4 12v batteries and zap the pack at the charging port. If you get the voltage up enough the charger will kick in. To be safe have a face shield on and do it outside.

[@E-BikingAdventures]

That's called bump charging. It's not the best way to do it. The best way is to use a variable DC bench power supply to get it over 40V, using a low current setting, then the charger will work.

[@stone8597]

Great video. My bike has a USB connection...do you think I could use your set up by just hooking into the USB?

[@Ricks_Tech_Talk]

I bet you could but it would take much longer. The usb port only puts out 5v as where the light will draw what ever it can

[@stone8597]

@@Ricks_Tech_Talk thanks much. I went and purchased the items off of Amazon. You sure made it easy for me. Thanks again.

[@aevanmangaba4959]

Boss how to fix the ebike battery 20ah 2months stock and dischrge but now i cant charge it.

[@E-BikingAdventures]

You need to measure with a multimeter what the battery voltage is at. If it's too low, then you will need to use a power supply to bring it back up to a voltage that your charger will except. Either that, or there is something wrong the the BMS or charger.

[@Vetteman40th]

Your link for the light bulbs is incorrect.

[@Ricks_Tech_Talk]

Thanks Buck I fixed it, but as of now they are out of stock

[@Silverxxx450]

How long does it take to discharge same battery as the one you are using?

[@Ricks_Tech_Talk]

Maybe a few hours if it has a full charge.

[@alanwaggett2010]

i have 52v 19.2 ah ebike battery , will this device drain that battery

[@Ricks_Tech_Talk]

The unit I linked to only work on 12V-48V, Im sure they make one for 52v

[@alanwaggett2010]

can you send link for 80% charger that you use

[@Ricks_Tech_Talk]

lunacycle.com/batteries/chargers/ Just look for the unit that matches your battery size

[@kengrant7802]

Where can I get these bulbs ? Amazon does not have them and I have searched but can't find them anywhere .

[@Ricks_Tech_Talk]

I found some that would work. amzn.to/46f07wG You want to look for 12 to 85v DC LED light with E26 socket hope that helps

[@frankkoller2622]

Try a place that sells campers.

[@Silverxxx450]

What brand of charger did you buy?

[@Ricks_Tech_Talk]

I use a Luna Charger

[@unclepete100]

the inbuilt BMS of a bike battery should protect against over-discharging. so if you're watching your pennies you dont't need the controller, just the load will do. and your charger should protect against overcharging. Cheers all

[@Ricks_Tech_Talk]

Yes. But to store the battery and keep the cells from chemical breakdown, a 50% charge will keep the cells healthy and help them last longer.

[@E-BikingAdventures]

There's a difference between storage charge and the BMS's cut off voltage.

[@exgenica]

I've found multiple brands of BMS boards to be far too unreliable to blindly rely on them to protect lithium-ion battery packs from over-discharge. They don't all work properly/as expected. I believe this is in large part due to the rampant counterfeiting and low-quality of parts often sold on the internet. Even manufacturers sometimes get shipments of counterfeit or "recycled" components and they end up in their products until the problem is identified...usually by their customers.

[@RSole9999]

My 48V ebike battery has a USB charging port that I could use to drain the battery, but I don't know if there is a buck circuit inside the battery case to reduce the voltage from 48V to 5V. It's possible that the USB port is connected to only several cells in which case the battery would become horribly unbalanced and most cell would stay at 100% charge. Not good.

[@Ricks_Tech_Talk]

I'm sure they use a step-down to reduce the voltage to 5v. If they used just a few cells for the USB, that would not be smart at all.

[@E-BikingAdventures]

No, it would not be smart, but we're talking about something that comes from China.

[@annmbraaten]

About how long did that take?

[@Ricks_Tech_Talk]

I takes about 1 hour 20 min to drain the pack .5 volts with 2 light bulbs

[@Vetteman40th]

What about the variable charger why no info on that.

[@Ricks_Tech_Talk]

You are the 2nd person to ask about it. I'll make a review and give my feedback about it. lunacycle.com/luna-charger-48v-advanced-300w-ebike-charger/

[@colinwatkins2950]

why bother going through all that when all you have to do is under charge your battery.for instance if my battery is low i charge it for 5 hours not 6,if its half i charge it for 3 hours if its at 70pct i charge it for 90 mins thats the way i protect my battery while using it.i never fully charge my battery unless im going long distance the following day.

[@Ricks_Tech_Talk]

You could, but you will never know for sure what so many mins will give you on a charge, unless you have a voltage meter hooked up to it. With something like this, you plug it in and walk away. Also the main point of this was to discharge it after giving it a full charge, when you couldn't go for a ride. Things happen and plans change. But we can agree a 100% charge is not healthy if it's not used right away.

[@S-420]

You never drain a lithium ion battery ever

[@Ricks_Tech_Talk]

This video was to show how to drain it for safe storage not to drain it completely