Straight after ride, leave battery to rest before charging?

[Fordulike]

I've always put my battery straight on charge as soon as I'm back from a ride.
The battery does get a good workout, so is probably still pretty warm when it gets put on the charger.

The question is, should I allow the battery to settle for a period of time before charging?

I know batteries don't respond well to stress, so wondered if I could be damaging it by being so impatient.




CRC Mass Air Flow Sensor Cleaner MAF

 

[trex]

it shouldn't matter. Charging current is quite low in comparison to discharging.

 

[Fordulike]

it shouldn't matter. Charging current is quite low in comparison to discharging.

I charge at 5 amps, would that be considered low still?








CRC Mass Air Flow Sensor Cleaner MAF

 

[trex]

charging current is usually 0.2C, 2A for a 10AH battery, 5 hours for 100% load.
Which charger do you have?

 

[Fordulike]

I'm using Ping's 48v 5A charger:











CRC Mass Air Flow Sensor Cleaner MAF

 

[trex]

It depends on the chemistry of your battery. 5A is not very high for electric bike batteries. For a 10AH Li-ion battery, charging at 5A would reduce the capacity twice as fast than charging at 2A.
The following chart is from Basic to Advanced Battery Information from Battery University website:

 

[Fordulike]

I'm still gonna be using the 5A charger for the sheer speed of charging, as I can sometimes go out twice in a day and use up 15Ah's each time.
Bringing the question back to the original subject. I can imagine the battery is still warm and stressed straight after use, so can it damage a battery if not allowed to settle and cool down before charging?









CRC Mass Air Flow Sensor Cleaner MAF

 

[Deleted member 4366]

The ions can move more easily when they're warm, so it's probably better to charge straight away.

 

[Fordulike]

Thanks everyone for your replies. Seems like I don't have to worry then









CRC Mass Air Flow Sensor Cleaner MAF

 

[mountainsport]

It depends on the chemistry of your battery. 5A is not very high for electric bike batteries. For a 10AH Li-ion battery, charging at 5A would reduce the capacity twice as fast than charging at 2A.
The following chart is from Basic to Advanced Battery Information from Battery University website:

Hi Trex , the slower the charging rate ie between 3-6hrs means that this is better for the battery ? Suppose a high speed hi-tech charger was being used, will this also harm the battery?

MS.

 

[trex]

slow charging is definitely better. Fast charging needs to have an appropriate BMS because the charger has no way of knowing which cell is being overcharged.
In Li-ion batteries, the Lithium ions are transported by oxidation and reduction of a transition metal, usually Cobalt. Overcharging voltage (>4.2V per cell) leads to this reaction: Li + CoO2 -> LiO + CoO which will permanently reduce the capacity of your battery.

 

[amigafan2003]

Fast charging needs to have an appropriate BMS because the charger has no way of knowing which cell is being overcharged.

Unless the charger is cc/cv. I charge my 12ah pack at 8 amps and is fully charged in 2 hrs, it always stops at at the 62.25v I set it at (4.15v per cell).

*pic is when I was charging 12s, I'm on 15s now.

 

[mountainsport]

slow charging is definitely better. Fast charging needs to have an appropriate BMS because the charger has no way of knowing which cell is being overcharged.
In Li-ion batteries, the Lithium ions are transported by oxidation and reduction of a transition metal, usually Cobalt. Overcharging voltage (>4.2V per cell) leads to this reaction: Li + CoO2 -> LiO + CoO which will permanently reduce the capacity of your battery.

Nice one my loving Trex, can overcharged cells become split and leak? Secondly Trex, since that we are on the topic of battery cells, when a battery has been fully charged and not to be used for a few days, on average what should be an acceptable discharge rate for each cell or as a whole ie as in a combination of all the cells ? Thank you.

MS.

 

[mountainsport]

Unless the charger is cc/cv. I charge my 12ah pack at 8 amps and is fully charged in 2 hrs, it always stops at at the 62.25v I set it at (4.15v per cell).

*pic is when I was charging 12s, I'm on 15s now.

I'm confused, and very sorry for this but should every battery show the same 4.15v per each cell? Do you have a 60v battery pack or does this depend on the amount of cells you have? Please explain why it stops at 62.25v.

MS