My phone is not charging, knowing that there is no problem with the charger or electricity, why!

For your peace of mind, perform all the steps provided in this support article:--> If your iPhone or iPod touch won't charge .

If the issue still persists, you already know what to do.

Regards and best of luck.

Giulio

Your battery has reached the critical point of its life, and, be careful, it can have unpredictable behavior.

1st thing to do: create a full backup of your iPhone, before the battery dies completely.

2nd: get an estimate of your battery replacement, using this link:--> Choose Your Country or Region

3rd: make an appointment (*) and have your battery replaced at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> https://locate.apple.com/choose-country-region .

4th: see these instructions:--> Get your iPhone, iPad, or iPod touch ready for service - Apple Support

Regards

Giulio

(*) You can do it:

• Online:--> Genius Bar Reservation and Apple Support Options - Apple;
• Contacting a local Apple Store or AASP among the list provided above;
• Using the "Apple Store" app, available and downloadable from AppStore.

Rashafaris wrote: "Yes it’s the original one , it’s 79%"

79% is not healthy and is the level at which Apple recommends replacing the battery. So have the battery replaced and your iPhone will then charge normally:

iPhone Battery & Power Repair

About genuine iPhone batteries

Repair Provider Verification

(Articles found by searching Apple's Knowledge Base.)

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Since you mentioned already in another comment that the battery is original, check whether the iPhone’s charging port is clean or a little dirty. If it’s a little clotted with dirt or debris then gently with a toothpick cleanse the port properly from side to side, DO NOT directly poke the charging port head on because that can damage the port. If you are not confident, head down to any technical shop and let them clean it for you.

this is just a simple method, if not working then your battery may have completed its life cycle and would require either a service or a complete replacement.

hope this helped.

Rashafaris ~ Does your iPhone 11 Pro Max still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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But as recommended did you check the phone’s lightning port for debris? Pocket lint or dust in the port can prevent the phone from charging.