Balancing the battery's 90 (Trophy LR) or so cell modules ensures they are all equalised at 100% charge, this will ensure that each single cell is protected from being overcharged at 100% or below min volts when the pack is very low. Sort of resets everything to make sure all the cells stay within limits.
In your case, if you routinely set the max charge to 80% and never charge to 100% then you'll probably never overcharge any of the cells anyway. Then if you don't let the pack drop below 10% then you'll also probably not drain any one cell too low either. But, again in your case, NEVER try to charge to 100% on a DC Rapid charger as your cells are not balanced and the risk of overcharging one/two out of balance cells is now greater, this can cause pernament damage to those cells. If you ever need to charge to 100% then always do it (or the last 20% anyway) on AC fast or granny charger, and if you can then let it balance as well.
Good advice !.
If
@EVready you intend to charge your LR in that nice sweet spot window, between a low of around 25% and then up back up to 80% SOC, that should be fine.
You are not stressing the pack in anyway.
I know I lot of people will say, that you have all that range and you are not using it !.
But it's not that, you charge to suit your likely usage requirements.
Why charge and balance to 100% if your usage over the next week is local based stuff ?.
When you need to take on that larger trip, then you have the capacity in the pack and then charge accordingly to the 100% mark if needed.
Avoid letting the SOC drop WAY to low on a regular basis, then charging it close to 100% ( without balancing ) on a regular basis, this is not really good practice on a regular basis.
Also charging to 100% and then letting the car sit at that high SOC is not kind to your pack either.
We collected our LR in mid March, we have now covered over 3,000 miles.
I find charging from around 30% SOC back up to 80% SOC will satisfy our usage, for majority of the time.
Remembering that when charging a Gen 2 LR to 80% you are still getting around 210 miles of predicted range, this time of the year.
I have charged to 90% once, in order to make a longer trip.
So, NO - I have not performed a balance cycle yet in the three months and 3,000 miles !.
Am I concerned - NO !.
This was a regular thing on our Gen 1 ZS EV and I could never get it to complete a balance cycle in less than about 3 hours.
Even though it was conducted very frequently.
Longer balance cycles are common on Gen 1 cars who had the BMS update done.
Factory software cars, regularly about 45 mins ( ish ) to about 1.30 max.