geladen
charged
Charged with electrical energy and ready for use. Refers to batteries and electronic devices.
Mein Handy-Akku ist wieder voll geladen.
My phone battery is fully charged again.

charged / loaded / invited
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charged
Charged with electrical energy and ready for use. Refers to batteries and electronic devices.
Mein Handy-Akku ist wieder voll geladen.
My phone battery is fully charged again.

'Geladen' (charged/loaded/invited) is the past participle of the verb 'laden' (to load/charge/invite). The many meanings of 'geladen' come from the different meanings of the verb: to charge something (battery), to load something (weapon), to invite someone (guest), or a tense situation.
Nachdem er sein Handy geladen hatte, konnte er wieder telefonieren.
After he had charged his phone, he could make calls again.
The noun that 'geladen' (charged/loaded/invited) describes reveals the meaning. An 'Akku' (battery) is charged, a 'Gast' (guest) is invited, a 'Pistole' (pistol) is loaded with ammunition, and a 'Stimmung' (mood/atmosphere) is tense.
Die Atmosphäre im Raum war nach der Diskussion sichtlich geladen.
The atmosphere in the room was visibly charged after the discussion.
In a technical context, 'geladen' (charged) refers to devices with a rechargeable battery. Typical adverbs are 'voll' (fully), 'halb' (half), or 'nicht' (not) charged.
Der Akku meines Laptops ist nicht vollständig geladen.
My laptop battery is not fully charged.
When a person or an atmosphere is 'geladen' (charged), it means that it is full of tension or suppressed anger. It describes a negative, explosive mood.
Er kam nach dem Streit mit seinem Chef sichtlich geladen ins Büro zurück.
After the argument with his boss, he came back to the office visibly charged.
The combination 'geladene Gäste' (invited guests) is a very fixed and common expression. It refers to the people who have received an official invitation to an event.
Die geladenen Gäste wurden gebeten, ihre Plätze einzunehmen.
The invited guests were asked to take their seats.
In physics, 'geladen' (charged) means that a particle carries an electrical charge. It is almost always combined with 'positiv' (positively) or 'negativ' (negatively).
Ein Elektron ist ein negativ geladenes Teilchen.
An electron is a negatively charged particle.
full
'voll' and 'geladen' can both be used with batteries and devices. 'voll' emphasizes that the battery is completely full, usually at 100 percent or almost 100 percent. 'geladen' means that a battery has electrical energy and can be used. It does not necessarily have to be completely full. Learners may confuse the words because in everyday language people often say: 'Der Akku ist voll' (the battery is full) or 'Der Akku ist geladen' (the battery is charged). If you want to say precisely that the battery is filled to its maximum, 'voll' fits better. If you only want to say that the device is ready to use, 'geladen' works well.

Mein Laptop ist geladen, deshalb kann ich im Zug arbeiten.
My laptop is charged, so I can work on the train.
Vor der langen Fahrt ist der Akku meines Handys voll.
Before the long trip, my phone battery is full.