Charging Battery to 85%

[Hard Tail]

Finally bit the bullet and purchased one of those Canadian Cycle Satiator universal chargers. So far so good, nice unit and allows me to charge my 52volt batteries up to 85% or full charge as required. Turns out the 85% option more than facilitates my 50klm commute ride. My one remaining nagging concern, is it good practice to repeatedly charge to 85% or should I charge to full 100% on occasion too.
Any help/ ideas from the brains trust greatly appreciated.

[Cyclist83]

Charge to 100% every so often so that your pack can balance.

[Gr8fun]

It depemds on how your bms balance config. Balancing on the older luna batteries was done at higher voltages and needed to be charged to 100% to balance. That has changed to trying to balance continuously? So no worry on the wolf batteries.
in my case i have my bms to start balanve at56 volts. 80%. So at 85 they are balanced to .005 volts from highest to lowest cell groups. Charging fast and drawing heavy and deep increases the differential and may take several cycles to rebalance. Year old battery. 150 cycles. Still has same capacity as new.

[Tommycat]

May I know the particulars of your BMS. Sounds like a nice one. I wonder if there is a downside to balancing at a lower voltage...

[Gr8fun]

I have a bluetooth xiao xiang. I do notknow if there is a downside to balancing at the lower voltage. There is a parasituc draw but as i use it everyday not a problem. But it logs many functions and adjusts battery patameters. I find it very useful. There is an option for balancing while discharging too. May be a problem for long term storage.
if you let your phone battery go dead you can not turn on battery....duh.

[Hard Tail]

Thanks Gr8 and Cyclist. As confused as ever but actually quite happy with my new charger. Basically I charge my battery back to 85% afrpter each ride and leave them stored in that configuration. Before a longer ride I’ll just then top the battery up. If the charger lasts longer than my previous cheap units I’ll be happy.

[lancelot152]

I have a bluetooth xiao xiang. I do notknow if there is a downside to balancing at the lower voltage. There is a parasituc draw but as i use it everyday not a problem. But it logs many functions and adjusts battery patameters. I find it very useful. There is an option for balancing while discharging too. May be a problem for long term storage.
if you let your phone battery go dead you can not turn on battery....duh.

i'm looking at a xiaoxiang or ANT bluetooth bms or an bluetooth active balancer board
is there a guide somewhere to teach you about all these settings.
im thoroughly overwhelemed by all these settings. I mean this helps but doesn't explain all of the settings

https://www.endless-sphere.com/forums/viewtopic.php?t=93908#p1375422

thanks

[Gr8fun]

It is even more complex than the display read out.
there is another tool available to set more parameters.
I had an incident where the bms functioning lost some of its abilities. I took it to my support battery man and he reset it using this tool.
i still like the way it works and the parameters i have set.
But really this is overkill and needless for most people. Unless you are obsessed by the need of redundancy and inconsequential information, i would stay away. Complexity is just more things that can go wrong. They will.
I have not had any real issues with parasitic draw. If you are going to store your bike for a month, you could drain battery if not charged to 80 % @ beginning.
i do like my solar panel mounted on bike. This has caused no problems, it has increased my daily and trip range, never plugging in and normally running battery at 50 to 75% should make battery last 1000s of cycles.
i do like the logging functions. The accuracy of the volt ammeter and watts. Gps speedo.eter.
It has been excellent tool for verification of the efficiency of my solar panels.
I do not like in tt that it is unstable. Many times it will refuse to communicate. Program will not open. Reload program to phone. Reboot phone . And general pita.
helpful?

[jGecko]

Undervolting is a good practice to extend the lifetime of a battery pack, but keep in mind that if by doing so you end up draining the pack almost to its full "safe" depletion level every day, then that also stresses the battery and lowers the lifetime. Just don't repeatedly drain the batteries down too far. For example, charging to 85% and draining to 20% every day is a lot better for the lithium cells then charging to 85% and draining down to 2% every day. And, as someone said, periodically putting them through full charge/recharge cycles to let the BMS re-balance the cells is good, too. However, if you're going to store a cell(s) for over a month put it in storage mode. There's very good info on caring for lithium cells at batteryuniversity.com

[Nickimathew]

Adjusting on the more seasoned luna batteries was done at higher voltages and should have been charged to 100% to adjust. That has changed to attempting to adjust ceaselessly? So no concern on the wolf batteries. for my situation I have my bms to begin balanve at56 volts. 80%. So at 85 they are adjusted to .005 volts from most noteworthy to least cell gatherings

[johnmorrow]

Don’t just leave your electric bike battery on the charger for long periods of time — think several days or more. When you do, you can create a situation wherein the battery will discharge leaving it at perhaps 95 percent of capacity. The charger then goes to work, topping off the battery. This cycle of minor discharges and topping off continues creating a series of poor charging cycles.

Instead, use a timer on your mobile device to remind you to take the battery off of the charger.



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