Hello,
We bought another hp calculator this weekend at a garage sale. It is in very good condition except the model tag is missing & the batteries are dead. After looking at pictures I determined that it is a 12c. Not quite as good a buy as the xpander from last weekend but not bad for $2.
Anyway, where is a good place to buy batteries for these calculators? I see calculators ALL the time that have dead batteries. I would like to keep a supply on hand to test these when I see them. I already printed the list from this site of rarity (it didn't help me today with no model # but we were guessing it was an 11c).
Also, which batteries will be needed to test most calculators? Are there 4 or 5 common types of batteries for hp's or are there more like 40 or 50 types?
Are there other good collectible brands to watch for?
Thanks for your help & suggestions,
Jennifer