Meaning trap
charge up
fill the battery
To charge up a device is to plug it in and fill its battery with power.
phrasal verbB1core
Don't mix these meanings
Same phrase, different job.
fill the battery
To charge up a device is to plug it in and fill its battery with power.
Hear it in context
Notice where the phrase sounds natural.
- I'll just charge up my phone before we head out — it's nearly dead.technology
- Have you charged up the speaker? We'll need it for tonight.technology
Fix the pattern
Pattern: charge it up / charge up your phone
WrongI need to load up my phone.
RightI need to charge up my phone.
Batteries 'charge up', not 'load up' — 'load' is a false friend here.
Patterncharge it up / charge up your phone
Don't confuse it
'Charge up' fills a battery; the opposite is 'run down' or 'die' (drain to empty).