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Recommended by Tesla Service Center to Charge Roadster in Range mode to optimise the battery

nicky _cwt

Member
Sep 22, 2019
38
5
Hong Kong
Recently, I visited to Tesla Service Center and discussed about battery care. They recommended me to charge in Range mode around once a month to optimise the battery.

Are you guys are doing this? I remember I read some posts that mentioned that charging in Range mode are harmful to the battery. Thus, not sure it is a good recommendation to follow or not.

Please give me your thoughts.
 

X.l.r.8

Supporting Member
Supporting Member
Feb 18, 2018
1,528
953
Toronto/Miami
I do, but I have to. I do long trips and it’s just outside the standard range, especially in winter. The balancing is done at the top end at max voltage but minimum amps so it makes sense to balance the pack occasionally, but once a month is possibly overdoing it. The cells don’t like to be stored at max voltage so it’s best to ensure as soon as it’s done to be driving. If you have not range charged before be careful of the initial loss of regen for the first few miles, even though I know it’s gone it still surprises me how fast the car rolls without it.
 
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dhrivnak

Active Member
Jan 8, 2011
4,495
3,762
NE Tennessee
Yes I ensure I range charge a few times a year to keep the battery in balance. And yes I try to drive a few hours after a full charge and I do not do it when above 80F
 

eHorses

Member
Jun 23, 2019
126
78
St, Pete, FL
I can see the benefits of range charging to balance the pack for a car that’s driven on a regular bases. But what would you do if the car is in storage or put away for the winter? Charge it to standard and reset it to storage mode after charging?
 

ML Auto

Member
Mar 8, 2014
742
767
SW Florida
You don't need to range charge to balance the battery. That is just bad advice. The only reason to range charge for rebalancing is when the battery is so far out of balance one brick can't maintain the minimum voltage required for balancing. But if that is happening you have a bigger problem anyways. Standard mode is plenty sufficient to keep it balanced. Just keep it plugged in and it will wake up every 24 hours to charge and balance itself. Storage mode does not balance at all-after a long time in storage mode the battery can be so far out of spec it can take weeks to recover.
 

eHorses

Member
Jun 23, 2019
126
78
St, Pete, FL
You don't need to range charge to balance the battery. That is just bad advice. The only reason to range charge for rebalancing is when the battery is so far out of balance one brick can't maintain the minimum voltage required for balancing. But if that is happening you have a bigger problem anyways. Standard mode is plenty sufficient to keep it balanced. Just keep it plugged in and it will wake up every 24 hours to charge and balance itself. Storage mode does not balance at all-after a long time in storage mode the battery can be so far out of spec it can take weeks to recover.

So, is it best to keep it plugged in at the standard charge setting even if you don’t driven it for weeksor in long term storage?
 

ion_1

Member
Aug 11, 2016
205
184
NJ
Standard charge, keep it plugged in, you will be fine. With time it will balance even if out of balance somewhat significantly.
Range charge should be minimized, although very minimal degradation, range charging is worse for Li-ion vs standard charge. This is just fundamental to the chemistry in Li-ion. As noted above, if you have to range charge, get state of charge down soon to minimize further degradation (although slight).

Also, it is much, much better to always recharge the car when convenient vs. letting the battery discharge low before recharging (i.e. many shallow dept of discharges vs. fewer deeper depth of discharges.)
 

hcsharp

Active Member
Jun 7, 2011
3,410
1,440
Vermont
You don't need to range charge to balance the battery. That is just bad advice. The only reason to range charge for rebalancing is when the battery is so far out of balance one brick can't maintain the minimum voltage required for balancing. But if that is happening you have a bigger problem anyways. Standard mode is plenty sufficient to keep it balanced. Just keep it plugged in and it will wake up every 24 hours to charge and balance itself. Storage mode does not balance at all-after a long time in storage mode the battery can be so far out of spec it can take weeks to recover.
This is correct.^^^ All of it. The advice to charge in Range mode once a month is obsolete (by nearly 9 years). Tesla changed the firmware in 2011 to balance after every standard mode charge. For long periods of storage it's safer to leave it plugged in standard mode. Storage mode doesn't leave enough "cushion" of charge if something goes wrong and you're unable to charge it for a while.

Having said all that, it doesn't hurt to charge in Range mode once in a while if you need it for a long trip.
 
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