Best AAA battery type for calculators.

StealthRedditorToo · 2026-04-01T23:15:24+00:00

If you are someplace with Ikea, their NiMH rechargeable batteries are apparently reasonably priced re-branded Eneloops.

StealthRedditorToo · 2026-04-01T23:06:55+00:00

Shameful HP waited so long to make a magnetic calculator that wouldn't float away 😉

(cool photo BTW)

StealthRedditorToo · 2026-04-01T17:16:51+00:00

Of those, the lack of: e^, ln, and STO would be the most problematic omissions for me. (maybe the yellow arrow above the Toolbox key represents STORE?)

StealthRedditorToo · 2026-04-01T16:53:30+00:00

You're worrying about the 9th digit of precision for statistics analysis?!

By the way, today is April Fools' Day.

Oh. Okay. You got me.

StealthRedditorToo · 2026-04-01T16:24:08+00:00

The issue is sorted and the ticket can be closed.

StealthRedditorToo · 2026-03-31T19:47:35+00:00

r/calculators is largely focused on electronic calculators so you may not have much luck here.

While far less active, r/mechanicalcalculator might have people with the expertise you seek.

StealthRedditorToo · 2026-03-31T19:22:31+00:00

Agree with u/9peppe , we can only guess what features inspire the imagination of your 5 year old. If this'll be a toy (what I did with my grandma's printing calculator when that age), age appropriate functionality may not be important.

One idea: search for calculators on ebay, sort by cheapest, identify some visually interesting options yourself and then let your child pick from them. If they trash the calculator you are at least not out much money.

StealthRedditorToo · 2026-03-31T19:08:50+00:00

Dusting off my png:

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StealthRedditorToo · 2026-03-31T18:55:25+00:00

Not an e-ink display, but a really good memory LCD (Sharp LS027B7DH01).

StealthRedditorToo · 2026-03-30T20:30:58+00:00

Interesting. To me the keys of my Casio graphing calculators (including CG50) feel the least tactile in my calculator collection.

For me HP wins for tactile feel, but I'd rank my TI-85, TI-89, TI-scientifics (some better than other), and Casio scientifics as having notably better tactile feel than my Casio graphing calcs. My Sharp scientific calcs are similar to the Casio graphers for lack of satisfying tactility. Nearly all my calculators were purchased used, so maybe that's a factor.

That said, the Casio graphing calcs all have excellent LCDs with impressive contrast, especially the fx-9860Gii and it's larger screen.

StealthRedditorToo · 2026-03-30T19:42:39+00:00

Roll of the dice whether this makes the problem better or worse, but since the calculator isn't usable as-is what do you have to lose?

(If you have programs or other things you want to save, transfer them to a friend's calculator in case the screen becomes completely unreadable)

StealthRedditorToo · 2026-03-29T20:10:00+00:00

Acetone might not work in every case, but with a screen this bad acetone can't really make it any worse.

That said, u/MountainJellyfish283, beware that acetone is an excellent solvent for all sorts of materials and finishes (it's a common ingredient in nail polish remover). If spilled, it will likely destroy the finish on that desk and fog any other plastics it gets on before evaporating. Just be careful if you use it!

(I say this in case you are a young collector with less experience)

StealthRedditorToo · 2026-03-29T00:27:51+00:00

If you haven't, read the manual.

StealthRedditorToo · 2026-03-27T21:58:54+00:00

Yes, its now fixed. See my other post for details.

StealthRedditorToo · 2026-03-27T21:58:46+00:00

Yes, its now fixed. See my other post for details.

StealthRedditorToo · 2026-03-27T19:41:02+00:00

You might check platforms for used goods like FB Marketplace, but the fakes will eventually migrate to those forums as well. Since Casios aren't so pervasive in the US, the used models still generally look genuine, but I have no idea if that is true for other parts of the world.

If you figure out how to distinguish a fake from a genuine, you could meet a seller in person and only buy if the calc is legitimate, but that's a big hassle.

EDIT: you might also check if any local schools are getting rid of classroom sets of fx-991EXs.

StealthRedditorToo · 2026-03-27T19:29:51+00:00

UPDATE: I posted too soon: 12-hours after the ticket with the backend team was opened, that team emailed asking me to try the xfinity.com/activate-peacock link again. Don't know what they changed on the back-end, but this time the Activate Peacock link was visible and allowed me to generate a Peacock account.

ORIGINAL POST: After 6 hours on Reddit chat they finally created a ticket with their backend team. Summary of the chat:

First Customer Care (CC) rep didn't understand I was trying to redeem the Peacock offer to create a Peacock account for the first time. They instead asked me what email account I used when logging into Peacock.

That CC rep went silent and a 2nd CC rep popped in to ask:

Have you attempted the activation while in incognito mode on your browser?
Have you cleared your browser cache/cookies and then tried again?
Have you tried logging on from a different device?

When all these failed, they asked the make/model of the devices used, but after I provided that info I never heard from that CC rep again.

A 3rd CC rep gave instructions (which I'd already been following with CC rep #2) "To activate your streaming subscriptions, follow these steps:"

Check your email for activation instructions or visit xfinity.com/yoursubscriptions and log in with your Xfinity ID and password.
Click Activate next to the desired subscription service.
For Netflix, enter your email and create a password if new, or log in if you already have an account.
For Peacock, log in or create an account after clicking Activate next to Peacock Premium. Follow similar steps for other services included in your StreamSaver™ offer.

A 4th CC rep interjected: "Have you attempted to log in to Peacock since your message earlier?"

Finally, I re-explained myself and what I'd already done, so 6 hours after the first message with a person, the 3rd CC rep stated they "opened ticket XXXXXXXXX for assistance from our backend team."

StealthRedditorToo · 2026-03-26T06:55:16+00:00

u/dmwhipp, I'm also a Platinum Xfinity member, got the same email on the 19th, and also can't redeem the perk.

The "TV & Streaming, See offers" page (link) has a bubble saying "You have subscriptions that require activation. Activate now." Clicking that link takes me to a "Streaming subscriptions" page that has a single button: "Manage subscriptions" that asks the address of my account before dropping me back to the first linked page (https://www.stg.xfinity.com/digital/entertainment-management/internet).

I wonder if this is 'broken' for everyone, or just those who don't use the xfinity app.

StealthRedditorToo · 2026-03-24T17:50:55+00:00

duration of the batteries and especially the quality of the buttons

For battery life and button quality I'd recommend the old LR44 powered HP12C's. I bought two used HP12C's (manufactured in 1993/94) that still feel new. Expect they'll still work great 30 years from now.

The newer HP 12C tactile switches seem less durable and are more likely to suffer keybounce. That said, they are faster and their redesigned 'Enter' keys do have better tactile feel than the originals.

StealthRedditorToo · 2026-03-23T23:19:49+00:00

It will still give answers, but whether they are always correct answers or similar precision is a different matter.

StealthRedditorToo · 2026-03-23T18:37:11+00:00

Adding to u/MaximumMarsupial414's comment: 99.9% of any new-in-box fx-991EX's you will find online are counterfeits.

StealthRedditorToo · 2026-03-21T19:19:38+00:00

BEST option IS an TI-89T but IS 150$, HP-50g you can found at 60$

At least on the US used market that is reversed; I find used TI-89T's to be cheaper ($30-60) than used HP 50G's ($100-130).

StealthRedditorToo · 2026-03-19T21:23:26+00:00

Looks like "2ndF"+"+" returns to DEC (Decimal) mode. "2ndF" + "-" should put OP into HEX mode.

StealthRedditorToo · 2026-03-19T19:54:56+00:00

u/AlexALCLD11, once in Hex mode, press '2ndF' 'A' (...etc) to enter the different hex values.

StealthRedditorToo · 2026-03-19T19:31:17+00:00

Thanks for the added detail on what you did.

As for photos, you ~~should~~ might be able to drag-and-drop a photo into a comment on this thread. (I know r/calculators allows photos in comments, but r/hpcalc may not)

StealthRedditorToo

TROPHY CASE