HP-37E "low" battery

My HP-37E works and look like new but even with brand new batteries, the red LED indicating low battery is always on. The calculator recently develop this problem after i dissambled the calculator and ressambled it. After i realize the problem, i open it again and clean every contact but always the false warning. All the display is crispy bright LED so i'm sure the calculator don't miss power. Can it be a discrete components one the power supply board? Which one? I remember someone here told me to ajust a small potentiometer on My HP-25 that has the same problem and it solve the problem but as i look on the 37E, no ajustement screw on this model...


I have seen these machines indicate low battery when new, fully charged, modern technolgy cells are installed. They all returned to normal operation after the machine ran for around 15 minutes after each charge. There is no adjustment pot in the Spice series machines.

Possibly Related Threads…
Thread Author Replies Views Last Post
  Very low Price of HP Prime? Harold A Climer 14 3,666 10-10-2013, 01:51 PM
Last Post: Frank Boehm (Germany)
  Low battery slow mode Marcel Samek 4 1,456 09-18-2013, 02:02 PM
Last Post: Harald
  Low power warning for HP-15C LE and batteries Nick_S 1 1,255 09-16-2013, 09:34 AM
Last Post: Hans Brueggemann
  15c LE low battery "indication" Ethan Conner 2 1,130 05-11-2012, 04:48 PM
Last Post: Paulo MO
  aOT--Battery/battery contact care advice needed Matt Agajanian 0 1,029 04-24-2012, 07:35 PM
Last Post: Matt Agajanian
  HP 15c LE low power anomalies Nick_S 21 4,548 03-31-2012, 09:32 AM
Last Post: uhmgawa
  WP34s low battery shut down? Harald 9 3,355 03-02-2012, 05:12 PM
Last Post: Jim Horn
  35s prompt for multi-character variables in program like "low footprint" root finder Chris C 8 2,646 02-14-2012, 06:52 PM
Last Post: Chris C
  wp34s low battery threshold Increased to 2.7V Jeff O. 8 2,180 10-20-2011, 12:37 AM
Last Post: Walter B
  HP 11C low battery indicator Onur Ilkorur 8 2,470 10-01-2011, 03:17 AM
Last Post: Katie Wasserman

Forum Jump: