Formal — to staff
100 · Yen · Shop
You
すみません、この電池の単三形はありますか？
すみません、このでんちのたんさんがたはありますか？
Excuse me, do you have the AA-size of this battery? (Lit: 'triple-A type')
Romaji: Sumimasen, kono denchi no tansan-gata wa arimasu ka? / Reply Romaji: Hai, kochira ni gozaimasu. Hoka no saizu mo achira no tana ni gozaimasu.
Reply
はい、こちらにございます。他のサイズもあちらの棚にございます。
はい、こちらにございます。ほかのさいずもあちらのたなでございます。
Yes, we have it here. Other sizes are also on that shelf over there.
Gesture & etiquette
Holding up the item (e.g., a device that uses the battery) or pointing to a label on a battery pack, then forming a number three with fingers to indicate 'san'.
Japanese battery sizes are often '単一' (tan-ichi - D), '単二' (tan-ni - C), '単三' (tan-san - AA), '単四' (tan-yon - AAA). Pointing to a sample or picture helps.