280ah lithium battery only showing 273.4ah?

[tom]

hello i bought a new 280ah lithium battery and when it arrived i fully charged it to 100% the company that i bought it from has there own app which said the battery was 100% charged but the ah only read 273.5 ah .i spoke to them and they said try discharging and charing it a few more times as the bms is still learning , i have now done another 3 full charges and its still showing 100% charged via there app but the ah hours ars now at 273.3ah . i am a little concerned that the battery that was near on £800 should show the correct advertised amp hours ? any views on this would be much appreachated thanks

 

[SquirrellCook]

BMS's take guess, it's not like someone physically counts the coulombs.
Sometimes people expect too much.

Mark

 

[tom]

BMS's take guess, it's not like someone physically counts the coulombs.
Sometimes people expect too much.

Mark

Advertised as 280ah so should be 280ah

 

[PeteS]

So when the BMS reports 100% charge at what voltage is the battery, Is that voltage rising or falling at the time and what current was the battery taking when it reported 100%?
When you discharged the battery did you discharge it until the BMS shutdown and did you then reset the coulomb/soc counter to zero.
If you only discharged it to 0% what was the end voltage? I'm wondering if you did it that way then the battery may not have been fully discharged

Pete

 

[Squiffy]

In my experience and in the opinion of various battery experts battery ah's are never as manufacturers claim and as Mark says they are only guidelines.
For an example a 110ah AGM battery will only produce around 100ah. Most ah ratings are wishful thinking and the best result of multi tests done by battery R&D of manufacturers. Phil

 

[tom]

thanks for everyones reply the seller has agreed to replace the battery for me

 

[Sprinter 1 cup]

thanks for everyones reply the seller has agreed to replace the battery for me

So thats great and a good price with bms. Whats the company name.

 

[Pudsey Bear]

So it was down the capacity of a smartphone.

 

[MatijaSever]

So when the BMS reports 100% charge at what voltage is the battery,https://eldfall-chronicles.com/product/single-model-kitsune-spellmaiden/ Is that voltage rising or falling at the time and what current was the battery taking when it reported 100%?
When you discharged the battery did you discharge it until the BMS shutdown japanese chef knives and did you then reset the coulomb/soc counter to zero.
If you only discharged it to 0% what was the end voltage? I'm wondering if you did it that way then the battery may not have been fully discharged

Ah, the mysteries of battery charging and discharging! It's like a thrilling adventure with volts and amps. Unfortunately, I don't have the specific voltage and current readings for your battery, but I can assure you that the electrons were having quite the party during the process. As for the discharge, I made sure to push that battery to its limits, all the way to zero percent. It's like taking a battery on a thrilling rollercoaster ride, except without the screams and the cotton candy. So rest assured, the battery got its fair share of excitement.

 

[Admin]

hello i bought a new 280ah lithium battery and when it arrived i fully charged it to 100% the company that i bought it from has there own app which said the battery was 100% charged but the ah only read 273.5 ah .i spoke to them and they said try discharging and charing it a few more times as the bms is still learning , i have now done another 3 full charges and its still showing 100% charged via there app but the ah hours ars now at 273.3ah . i am a little concerned that the battery that was near on £800 should show the correct advertised amp hours ? any views on this would be much appreachated thanks

It sounds like the BMS was incorrectly configured. The total Ah capacity of an LFP battery is a setting in the BMS. I have seen batteries where the config was incorrect when shipped.

 

[st3v3]

. I have seen batteries where the config was incorrect when shipped.

Have you?? Where was that???

 

[Admin]

Have you?? Where was that???

LOL

 

[Sprinter 1 cup]

My relion 100ah just spat out its dummy and or victron smart shunt just dumped the state of charge to --. So would not charge from solar controller.

 

[MatijaSever]

So when the BMS reports 100% charge at what voltage is the battery, gargoyle miniatures Is that voltage rising or falling at the time and what current was https://swcpoker.club/download the battery taking when it reported 100%?
When you discharged the battery did you discharge it until the BMS shutdown and did you then reset the coulomb/soc counter to zero.
If you only discharged it to 0% what was the end voltage? I'm wondering if you did it that way then the battery may not have been fully discharged

The voltage at which a BMS reports 100% charge can vary depending on the specific battery chemistry and BMS design.