Have to charge the battery on my 2022 Hyundai i20 n-line every 4/5

Should last longer than that if FULLY charged . Have they checked for a possible battery drain ?

its been in 3 times now all they do is update the software , battery is good , the battery doesnt go flat , it seems when it drops below 80% it shuts various things down , its a mild hybrid so its shuts down the sailing mode also the stop/start

That's normal on a lot of cars when battery drops to certain level . Make sure you have the battery FULLY charged then check this . I'm on a large American forum and we had similar faults with various makes , dealership unable to solve . It turned out the car key / remote was left in the house near to and in range of the cars . By doing so it was still transmitting to car and not letting all systems fully shut down as they should , thereby running the battery down . Might / might not apply to you

Thanks for your reply but i dought its not what you said because I always when in the house keep the remote in one of those pouch type things that stops the signal escaping because this is keyless entry hopefully it stops anyone trying to steal it, but i will try your surgestion and keep the key futher away. I bought this car new in june 2022 and in November it would not start , The AA came out and told me the battery was flat , they gave it a 10 minute charge and it started they put a meter on the battery when it was running and it was reading 14.5 volts and told me all was good , so it took from June to November to run down flat , as I say Hyundai have had it 3 times and cant find any fults with it , I have found out that it doesnt have an altenator it has a generator and its run by the ecu and the ecu tells it when to charge , I have been told to keep the headlights on to tell it to charge , but the end of the day Hyundai havent got a clue whats wrong with it O bye the way Im not the only one having this problem theres loads of owners having the same trouble

If you have a pouch it wont be what I suggested . An alternator and generator are the same thing , different names .As for " I have been told to keep the headlights on to tell it to charge " is rubbish and not needed for charging the battery

Im afraid your wrong there, yes cars have alternators (ac) that produce alternating current which is converted to direct current (dc) this car is fitted with a generator which the current is generated in direct current (dc) it also acts like a starter motor to start the car theres no starter motor or starter ring on this, it has a drive belt to start it so its completely silent when its starts

Always happy to learn something new