In a previous news we were presenting you the new HP-Prime and its rechargeable battery providing a voltage of 3.7 Volts like on the TI-Nspire and TI-84 Plus C Silver Edition, but with a much greater capacity of 1500 mAh and thus an increased energy of 5.55 Wh !
Without any cable unlike on TI models, the HP-Prime rechargeable battery is very easy to install and remove.

According to an information revealed by Tim Wessman from HP on the TI-Planet HP Wiki, the battery coming with the HP-Prime is actually of the same type as those used by the Samsung Galaxy S3 smartphone, which is great a news!
On the one hand, with the existence of generic brands of batteries for this phone, when the time comes you'll be able to buy a HP-Prime replacement battery for cheap!
On the other hand, the most common battery for Samsung Galaxy S3 does provide a compatible voltage of 3.8 Volts, but has a capacity of 2100 mAh and therefore an energy of 7.98 Wh. Thus we can expect from it performances 40% higher than the original HP-Prime battery! The replacement will get you a much better autonomy!

You can even try to opt for more powerful Samsung Galaxy S3 rechargeable batteries, especially in generic brands. Exceeding 2500 mAh, 3000 mAh or even 4000 mAh capacity is possible for an unexpected autonomy! But beware, these batteries are often thicker and thus require some accessories designed for the phone (back cover replacement, special battery cover, battery case extension...). These accessories probably won't be usable with the HP-Prime case. Si if you opt for these powerful batteries, make sure that you buy rechargeable batteries which don't require such accessories.



Source:
http://tiplanet.org/forum/viewtopic.php?t=13143&p=149441&lang=en

A higher capacity (mAh) won't do anything. Higher voltages (higher than 3.7V or 3.8V) would probably fry something though, if the calc isn't protected by a fuse.

Hopefully this doesn't void the warranty or something. Seems pretty useful

A higher capacity (mAh) won't do anything. Higher voltages (higher than 3.7V or 3.8V) would probably fry something though, if the calc isn't protected by a fuse.

Ah ok, I guess it would be fine then. As others have said below, tho, I guess you just have to be careful about your warranty (if you have one).

Thank you for your reply Tim.

I just included the only source I had at that time about the battery.
But I can still edit if you want me to put another source.

By the way, can installing third-party OSes or a patch to run ASM/C programs void your warranty?