Low power warning for HP-15C LE and batteries

As has been reported on the Forum, the built in low-power * warning for the HP-15C Limited Edition sadly does not work, as the contents of memory get corrupted long before it comes on.

However, I noticed that towards the end of battery life, pressing and holding a key such as [Enter] causes the display to dim considerably due to the current draw. By waiting until this reduction in contrast is around half, i.e., display is distinctly grey rather than black, changing batteries around this point seems to avoid memory corruption or loss. Using this contrast change as a proxy low-battery indicator I have had no further problems.

As an aside I found that Ikea offers Lithium CR2032 batteries (under the name of Solvinden) that are cheap enough at 3.50 euros for eight to make this anticipatory battery replacement less of an issue. It is these batteries that I have been testing for the last 18 months, getting around 4 to 6 months a set with frequent use of the calculator.



the interested reader may have a look here:



Possibly Related Threads…
Thread Author Replies Views Last Post
  HP 50g : More on best rechargeable batteries Miguel Toro 1 1,691 12-12-2013, 05:31 PM
Last Post: David Hayden
  [HP-Prime CAS] "Warning, ^ (Command) Is ambiguous on non square matrices"?? CompSystems 1 2,106 12-07-2013, 07:15 PM
Last Post: CompSystems
  HP 50g : Best rechargeable batteries ? Miguel Toro 14 4,550 11-16-2013, 03:35 PM
Last Post: Dieter
  HP Prime Save Power Turn Off Not Working Timothy Roche 12 4,023 10-27-2013, 01:41 PM
Last Post: Michael de Estrada
  Storing HP-42S without batteries Yriarte 4 1,650 10-19-2013, 08:32 PM
Last Post: walter b
  HP-12C batteries Yriarte 4 1,795 10-12-2013, 10:39 PM
Last Post: Yriarte
  Very low Price of HP Prime? Harold A Climer 14 3,836 10-10-2013, 01:51 PM
Last Post: Frank Boehm (Germany)
  BATTERIES' SWAP ON HP 48GX aurelio 7 2,492 10-06-2013, 07:50 PM
Last Post: aurelio
  OT - A lucky find - Busicom Handy-LE LE-120A Cristian Arezzini 2 1,760 09-26-2013, 04:43 AM
Last Post: Cristian Arezzini
  Low battery slow mode Marcel Samek 4 1,558 09-18-2013, 02:02 PM
Last Post: Harald

Forum Jump: