Battery charger for Genesis and other DPVs

[rjack321]

Mine is dropping no where near 1V/month. More like 0.1V/month

 

[stuartv]

Mine is dropping no where near 1V/month. More like 0.1V/month

Interesting. What voltage range is that?

Like I said, mine is just one data point. And I have really been wondering if the self-discharge would slow at lower voltage levels.

My cells are brand new ones purchased whenever I got the scooter (earlier this year?). I got the exact ones Jon recommended. They have only been fully charged 2 or 3 times and they dropped to 2.5V - 2.7V once, just in the last month which was when I sent it all to Jon. My point: I think my cells are very healthy and should not be dropping at an unusually fast rate.

 

[rjack321]

right now its sitting at 82% charge and has been for months. I didnt recharge after the last time I used it.

 

[stuartv]

right now its sitting at 82% charge and has been for months. I didnt recharge after the last time I used it.

I'm not sure what the percent means, or if it's even useful. Actually, I think mine was reporting 99% even when the voltage had dropped from 67 to 62V. It seems like I read in another thread that the percent doesn't update when it's just doing self-discharge. The percent only updates when you're actually running it. Thus why I think Jon has posted that we should pay attention to volts, not SOC (state of charge - i.e. %).

Is it an X.1 or X.2? And do you know what the actual voltage is?

 

[grantmac]

You're sitting at around 4.05v per cell?
Self discharge should be lower at a storage voltage of ~3.8v per cell which is considered the right long term voltage to store lithium ion.

 

[rjack321]

I'm not sure what the percent means, or if it's even useful. Actually, I think mine was reporting 99% even when the voltage had dropped from 67 to 62V. It seems like I read in another thread that the percent doesn't update when it's just doing self-discharge. The percent only updates when you're actually running it. Thus why I think Jon has posted that we should pay attention to volts, not SOC (state of charge - i.e. %).

Is it an X.1 or X.2? And do you know what the actual voltage is?

I double checked and you're right, the percentage doesnt record the storage losses. I was at about 3.5V though - after months and months of sitting in the garage. I am not sure how fast mine is self discharging anymore

 

[stuartv]

You're sitting at around 4.05v per cell?
Self discharge should be lower at a storage voltage of ~3.8v per cell which is considered the right long term voltage to store lithium ion.

I'm not at home for a few days, so can't check and don't remember for sure. But, that sounds right.

And, yeah, I was kinda thinking that SD would be slower at a lower voltage.

I double checked and you're right, the percentage doesnt record the storage losses. I was at about 3.5V though - after months and months of sitting in the garage. I am not sure how fast mine is self discharging anymore

Thanks for getting back to me on that. You had me starting to worry that my scooter wasn't as "fixed" as I thought it was. lol

 

[stuartv]

You're sitting at around 4.05v per cell?
Self discharge should be lower at a storage voltage of ~3.8v per cell which is considered the right long term voltage to store lithium ion.

Yes, they are now showing right around 4.03V per cell (4.02 - 4.04).

After 13 days, the total drop still averages to about 0.03V per day - or 1V per month (when starting at 72.something)

 

[Jon Nellis]

Make sure to close the phone app when you are not using it. If you just minimize it and leave it running in the back ground, the Bluetooth transmitter may remain ON and drain the battery faster.

 

[grantmac]

Make sure to close the phone app when you are not using it. If you just minimize it and leave it running in the back ground, the Bluetooth transmitter may remain ON and drain the battery faster.

If you use the Overkill app it shuts down after you close it.