Translation:I am looking for the charger, because the battery is dead.
It is not necessary or standard to insert a comma before "because". https://www.quickanddirtytips.com/education/grammar/when-to-use-a-comma-before-because
It's not what most English speakers would say, but imo it's perfectly correct. It's an idiomatic expression, and there are often multiple ways to interpret them, depending on one's preference.
It's a carry over from the days before rechargeble batteries, when dry cell ones that had been drained of power were useless and thus, "dead".