Johnberg51
Established Member
I've always wondered myself how much is the top protection buffer of the MG HV battery.
After I did some research myself and did read that the battery is having 18 modules each with 6 serial blocks of 110A.
So 108 blocks serial connected.
On the infoscreen I saw that the HV battery voltage is about 452V when 100% charged.
This means every seperate cell is having a voltage of 452 : 108 = 4,2 V
I did hope so much that this would have been 4,1 V.
It is a physical property that a LiOn cell is 4,2V when 100% charged.
My conclusion: the MG battery does not have a top protection buffer!
Everybody knows what the lifetime of an Ebike battery is, which is also charged to 100% without protection buffer!
I don’t use my car much, maybe a 100 miles a week.
I think it is very bad for the battery to charge 100% and then not use it for a day or so.
So now I think to do the following:
Charge 4 times to 80%
After 4 times proceed one fully charge to 100%, so MG can do equalization (balancing) of the cells.
Of course also charge to 100% when making a long trip at the same day.
Charging to 80% is easy, just use a granny set to 10A which result in 4,7%/hour. From 25 to 80% will take about 11-12 hours.
After I end the charging by unlocking the doors and remove cables.
Maybe you also could use a time switch, but I know that electronics are not happy with abrupt cutting off the main power.
I am very interesting in your opinion about this, maybe I am too much carefull.
Or maybe, I hope so, MG is having an other kind of battery protection.
I have attached a screenshot of a Youtube from Thailand.
After I did some research myself and did read that the battery is having 18 modules each with 6 serial blocks of 110A.
So 108 blocks serial connected.
On the infoscreen I saw that the HV battery voltage is about 452V when 100% charged.
This means every seperate cell is having a voltage of 452 : 108 = 4,2 V
I did hope so much that this would have been 4,1 V.
It is a physical property that a LiOn cell is 4,2V when 100% charged.
My conclusion: the MG battery does not have a top protection buffer!
Everybody knows what the lifetime of an Ebike battery is, which is also charged to 100% without protection buffer!
I don’t use my car much, maybe a 100 miles a week.
I think it is very bad for the battery to charge 100% and then not use it for a day or so.
So now I think to do the following:
Charge 4 times to 80%
After 4 times proceed one fully charge to 100%, so MG can do equalization (balancing) of the cells.
Of course also charge to 100% when making a long trip at the same day.
Charging to 80% is easy, just use a granny set to 10A which result in 4,7%/hour. From 25 to 80% will take about 11-12 hours.
After I end the charging by unlocking the doors and remove cables.
Maybe you also could use a time switch, but I know that electronics are not happy with abrupt cutting off the main power.
I am very interesting in your opinion about this, maybe I am too much carefull.
Or maybe, I hope so, MG is having an other kind of battery protection.
I have attached a screenshot of a Youtube from Thailand.