battery
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battery
A rechargeable energy storage device that supplies electrical devices with power. The short form of Akkumulator (rechargeable battery).
Der Akku von meinem Handy ist schon wieder leer.
The battery on my phone is already dead again.
energy
In a figurative sense, a person's personal energy, strength, or ability to perform.
Nach diesem anstrengenden Projekt ist mein Akku komplett leer.
After this exhausting project, my battery is completely drained.
'Akku' (battery) is a very common everyday short form of the technical term 'Akkumulator' (rechargeable battery). In almost all contexts, the short form is preferred.
Ich brauche ein neues Ladekabel für meinen Akku.
I need a new charging cable for my battery.
Common verbs used with 'Akku' (battery) are 'laden' (to charge) or 'aufladen' (to recharge). Typical adjectives are 'leer' (empty/dead), 'voll' (full), or 'schwach' (weak/low).
Mein Akku ist fast leer, ich muss ihn bald aufladen.
My battery is almost dead; I need to recharge it soon.
When talking about a person, 'der Akku ist leer' (the battery is empty) means that the person is exhausted and out of energy. You can, for example, 'wieder aufladen' (recharge) your battery on vacation.
Nach der langen Arbeitswoche war mein Akku am Freitagabend komplett leer.
After the long workweek, my battery was completely drained on Friday evening.
battery
Akku and Batterie are portable power sources for electrical devices. Akku specifically refers to a rechargeable energy storage device, whereas Batterie in ordinary usage usually means a non-rechargeable power source. So check whether the power source is meant to be recharged; in that case, Akku is the more precise choice.
Der Akku meines Handys ist leer, deshalb lade ich ihn über Nacht wieder auf.
My phone's battery is dead, so I am charging it again overnight.
Die Batterie in der Fernbedienung ist leer, deshalb ersetze ich sie durch eine neue.
The battery in the remote is dead, so I am replacing it with a new one.
