1. charged with too little electricity or power
2. billed or asked to pay too little money for something

1. past tense and past participle of undercharge: to charge too little money for something

Examples

• The phone battery was undercharged and died quickly.
• The customer was undercharged for the expensive meal.
• The mechanic undercharged me for the repair work.
• Her laptop remained undercharged after the brief charging session.
• The restaurant accidentally undercharged us for drinks.
• The electric car was undercharged for the long trip.
• They undercharged the client by fifty dollars.