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Hi. Newbie !! 3 weeks in. Have posted my impressions before. Love the EQC.

adv from you all regarding charging.
Firstly how much to charge. I normally do 80%. Once went on a long drive and charged 100%

secondly how often. Can we charge frequently. Does this affect battery warranty.
Thanks
 

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There will be others on the forum much more knowledgeable to correct or add to my knowledge but my information is that there is no warranty problem with charging frequency per se. Note though that if charging frequently is needed because you are doing a lot of miles then you may reach the 160,000km warranted limit quicker or whatever the limit is in your country.

Also note that my 2019 owner's manual says frequently topping-up to 100%, or frequently discharging to 0% too I suppose, is not recommended for battery longevity and even worse if leaving the car parked like that! Frequently ignoring this warning could theoretically affect warranty in the future. Manual also advises not to leave car plugged into charger once charging complete.

Charging frequently can even help keeping an ideal charge between at least 15% up to 80%, or more narrowly 30% to 50% especially if car will be followed by being parked up for "lengthy idle periods". I guess lengthy idle refers to a week or more but manual doesn't say exactly other than up to 80% is ok normally
 

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The Mercedes Me eco coach app gives the manufacturers advice on charging, parking and more, saying the charge level on parking has more effect on battery health than anything else. It recommends charging to less than 80% if parking for more than 24hrs and not parking for more than 10 minutes with 100% charge, so if you are charging to 100% at home for a long trip the next day you should be setting your charge point to complete charging at your departure time. This has the added benefit of setting off with a warm battery which helps achieve the best range, setting preconditioning for the same time also gets the cabin warmed by mains electric rather than using the car battery.
It’s generally not a good idea to charge to 100% while on a journey unless you need to as the charge rate drops as the battery gets near fully charged ( some cars take longer to get from 80% to 100% than to get from 30% to 80% ) and it’s quicker to move on at a lower charge and charge again later, rather than tying up a charge point others may be waiting to use.
 

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The Mercedes Me eco coach app gives the manufacturers advice on charging, parking and more, saying the charge level on parking has more effect on battery health than anything else. It recommends charging to less than 80% if parking for more than 24hrs and not parking for more than 10 minutes with 100% charge, so if you are charging to 100% at home for a long trip the next day you should be setting your charge point to complete charging at your departure time. This has the added benefit of setting off with a warm battery which helps achieve the best range, setting preconditioning for the same time also gets the cabin warmed by mains electric rather than using the car battery.
It’s generally not a good idea to charge to 100% while on a journey unless you need to as the charge rate drops as the battery gets near fully charged ( some cars take longer to get from 80% to 100% than to get from 30% to 80% ) and it’s quicker to move on at a lower charge and charge again later, rather than tying up a charge point others may be waiting to use.
Shame Mercedes did not think to let us programme the charge time in the car or app though 🙄. Here in France plug and play ie no internet connection models are common and mine installed by Mercedes is. Therefore stop start times are diff so sorry mine has done 3 or 4 100% charges left for a couple of hours. Generally it lives in the 30 to 50 range though. They should have to give you a SOH report when the car is serviced in my view.
 

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Shame Mercedes did not think to let us programme the charge time in the car or app though 🙄. Here in France plug and play ie no internet connection models are common and mine installed by Mercedes is. Therefore stop start times are diff so sorry mine has done 3 or 4 100% charges left for a couple of hours. Generally it lives in the 30 to 50 range though. They should have to give you a SOH report when the car is serviced in my view.
I agree with you on the ability to time charging via the car for those without programmable charge points and a SOH report would be interesting but maybe bolting the door after the horse has gone, by the time the SOH has shown a problem the damage has been done and it won’t show what caused the damage so you won’t know what action to take.
I also have left my car at 100% charge for longer than 10mins before I got the Eco coach app so I think that the recommendation in the Eco coach app regarding a maximum parking time of 10mins at 100% charge, if it’s so important, should really be made more prominent. A notice in the car or at least a large note in the drivers manual, especially as by some reports on this forum, the app is not available in all countries. It should also be a warning given by dealers on handling over a car to an inexperienced new owner. In fact far more emphasis on charging advice needs to be given by dealers to new owners, there should be no need for anyone to have to rely on forums for this information.
 
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