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The 48GX runs on three AAA type alkaline batteries. However, if the device was unused that long, the button cells used for backing up the RAM cards may also be depleted, and the calculator will report "low battery" displaying the ((.)) symbol, even with fresh AAA cells installed.
The RAM card mounted batteries are type CR2016.
Remove the calculator battery compartment door by pressing down and sliding it off away from the calculator.
Turn the calculator and shake the batteries out.
Replace with a fresh set of AAA alkaline batteries. Polarity is marked on the bottom of the battery compartment.
Replace the battery compartment door by sliding it back in place.
RAM card batteries:
Turn the calculator over and remove the plastic cover over the plug-in card ports (display-end of the calculator).
HP recommends to turn on the calculator while replacing the RAM card battery to avoid memory loss. I assume, your HP48GX has no marbles to recover by now anyway, so it does not matter, I guess.
Near the left side of the end of the card. you'll find the nail grip in the black plastic battery holder. Use a thumbnail to gently pull out the battery holder. There is one battery in each card (additional cards are options).
Remove the old battery from the holder and replace by a new CR2016 button cell. The "+" side of the battery should point into direction of the calculator's front.
Re-insert the holder with the new battery and check the RAM card is properly seated still.
Close the compartment by sliding back in the cover.
Yes, it has an internal button cell battery, type CR2032. You can replace it by removing the calculator's protective cover, and loosening the screws in the back plate. Carefully open the case and do not touch other internal parts. You may use a small screwdriver to aid in removing the old battery.
Insert the new battery in proper polarity and it should snap in place.
you need to replace all the battery leads in there but yes you can revive this just do to radio shack and by the battery leads pop open that device and solder the new leads in.. if you do not know how to solder then it can get trickey..
About the only thing that I can can think of is that you may need to replace the internal battery. It is located in a little door with a screw right above the AAA batteries.
Another thought. The calculator may be staying on and not doing an auto shutoff. The calculator should turn itself off if you forget to turn it off. You can check to see if this is happening by leaving the calculator on, going back later and checking to see if it turned itself off.
Try checking the contrast. It may have gotten turned down. Press the on key. Next press 2nd key and then hold the up arrow key. This will darken the screen. You can lighten the screen by doing the same, but using the down arrow key.
If this doesn't work and you've replaced your 4 AAA batteries, the calculator may need to be reset. In a little door with a screw right above AAA batteries is an internal battery. Take this and all batteries out for about 8 hours. Reassemble and see if this does the trick. If not, you might try replacing the internal battery. Hope this helps.
First try turning the calculator on and then pressing the 2nd key. Hold down the "up arrow". If the contrast has been turned down, this should turn it up.
If that doesn't work, could be that your calculator needs to be reset. Take out the internal battery located right above the 4 AAA batteries behind a small door with a screw. Leave all batteries out for about 8 hours. Reassemble and hopefully you can turn it on. If this doesn't work, you might replacing the internal battery. Hopefully one of these solutions will work.
The calculator needs to probably be reset (probable). You need to leave the internal battery out of the calculator for about 8 hrs. Put it back in and then put the AAA batteries back in. Hopefully this is what is wrong and then the calculator will worik.
Try holding [left][right][2nd][on], that reinitializes the calculator and clears the ram. If that doesn't work you could try reinstalling the OS (refer to manual for details). If it still doesn't work, you will probably have to call TI.