電池 and 電球: a power source and a light-producing part
Distinguish batteries from light bulbs and separate replacement actions from operating results.
Inserting a battery
電池, read でんち, means battery. 時計に電池を入れました。 means putting a battery into a clock or watch.
電池が切れました。 says that the battery ran out of power. It does not describe physically cutting it.
Replacing a light bulb
電球, read でんきゅう, means light bulb. 古い電球を新しいものに交換しました。 means replacing an old bulb with a new one.
電球が切れました。 means that the bulb burned out. Although both examples use 切れる, distinguish the operating condition of a battery from that of a bulb.
Action and result
電池を替えましたが、時計はまだ動きません。 says that the battery was changed but the clock still does not work. Do not turn replacement into a successful repair.
電球を二つ買いましたが、取り付けたのは一つだけです。 says that two bulbs were bought but only one was installed. Count purchases separately from installations.
Was the clock fixed in 電池を替えましたが、時計はまだ動きません?
Show the answer and why
No. The sentence says that it still does not work despite the battery replacement.