Texas Instruments Ti-nspire Rechargeable Battery

Not much to say in this review. The battery is fairly easy to install--make sure you have a small Philips screwdriver--and once it's fully charged it will last for a very, very long time. In fact, I have to wonder if a rechargeable battery is really necessary for this calculator. The calculator will still run for quite a while on AAA batteries, so slapping in a rechargeable battery that will only very rarely have to be recharged may be a little excessive. Even so, if you don't want to suffer even the most remote possibility that your calculator will run out of juice, then yes, go ahead and buy the rechargeable battery. You don't have to remove any AAA batteries you've already put in the device. Instead, you can use those as a backup in the unlikely event that your rechargeable runs out. That way, you'll pretty much annihilate the chances of the calculator running out of power during a test or some other inopportune time.

This battery can last many months on a singular charge even with regular use. It has not meaningfully degraded over time either.10/10 recommend for the Nspire.

I have a TI-nspire CAS and this product is great at saving the 4 AAA batteries that you can also install in the unit. It also comes with an AC power adapter so you end up with an extra one. :-)This product is NOT necessary if you buy a new TI-nspireCX-CAS (the color/backlit model). It comes with this kit included. It has to since it has no accommodation for AAA batteries.This battery works well in both systems but is only needed for the older model, unless the product is being purchased to replace a failed battery.

If I have any complaints it would only be that I wish the keypad release was on the top or side. If you have the slipcover on the back you have to remove it if you want to change the keypad. More of a convenience thing but the grapher is exceptional. I will probably use this calc for the rest of my life and never stray.

I am an engineer and purchased this for my Ti-nspire CAS that I use daily in my job. I love it. The battery lasts so long (still at 100% after a week of use). It has the ability to use the AA batteries as back up for the lithium pack, its really clever. It also came with a USB cable and wall charger, a lot more than I was expecting for the money. My only regret is that I didnt buy this sooner. Props to TI.

Excellent quality at a reasonable price.

TI is hard to connect with due to their service hours. My son's Nspire CAS calculator was not holding a charge, so I did some troubleshooting online with various forums and found out batteries only last a couple of years. Replaced his with this and it did the trick. Battery was very easy to replace myself and came with instructions on how to do so (not really necessary as it was pretty obvious - but it made me feel better going in to the swap.)

I bought this for the TI-nspire touchpad model which does not come with the rechargeable battery nor the wall charger. So not only will this rechargeable battery provides some additional insurance as a power source, the wall charger + USB cable also allows you to:1. Use the wall charger directly as a power source (even when your rechargeable battery or the AAA batteries both run out).2. Use the USB cable connected to any other USB capable power source (laptops, desktops) as a power source.3. In either of the above scenarios, the rechargeable battery will be charged.Note that I bought directly from Amazon, and the package comes with the battery itself, a wall charger and a USB cable. Not sure if other 3rd party vendors ship all 3 of them or just the battery--some user comments seem to indicate that (at least some of the) 3rd party vendors ship only the battery. So make sure what you will get as a package before you order from 3rd party vendors.