HP 41 Battery Pack Rebuild



#2

I have been dealing with a company in China that manufactures custom LiFePO4 battery packs (3.2V/cell). I bought 2 packs for my NLS MS-230 miniscopes to replace the D cell lead acid batteries. These have performed as expected. The LiFePO4 (Lithium iron) advantages over lead acid and other battery types are numerous: approx. half weight and size of lead acid, double the capacity, longer lifetime (up to 2000 times), no liquid electrolyte, and much safer than Lithium ion. These cells can be manufactured to any size or shape, even to fit inside the space used by the 4 1/2 N cell Nicads. A limitation is shelf life without a recharge within approx. 3 months since there is a lower voltage below which the cell starts to deteriorate. The over and under charge protection circuit for these cells will be included in the battery on request.

I noted the post on 1/2 N cell NiMH batteries dated 2005. This is worth checking out for a group purchase including me. The contact is:

Tina Rong(America Team),
Skype ID:eembgroup24,
Tel: 86-755-83022275(Ext.612,
Fax: 86-755-83021966,
group24@eemb.com; http://eemb.com


Possibly Related Threads…
Thread Author Replies Views Last Post
  HP-41(CL): The easiest way to transfer FOCAL programs from a Linux PC to the HP-41 Geir Isene 13 5,841 12-05-2013, 02:40 AM
Last Post: Hans Brueggemann
  HP 50G Multi Lingual Pack – Polski Software49g 3 1,739 04-10-2013, 10:40 AM
Last Post: Massimo Gnerucci (Italy)
  HP-41 Quiz: How to pack 100k in ROM? (on-line) Ángel Martin 10 3,019 09-02-2012, 10:35 PM
Last Post: Luiz C. Vieira (Brazil)
  Unknown battery pack Nick R 4 1,972 05-27-2012, 01:32 AM
Last Post: Nick R
  Disassemble Battery Pack 82028B (woodstock) Jacques Karensky 0 1,166 05-19-2012, 03:39 AM
Last Post: Jacques Karensky
  aOT--Battery/battery contact care advice needed Matt Agajanian 0 1,190 04-24-2012, 07:35 PM
Last Post: Matt Agajanian
  LiPo rechargable for 41 pack rebuilding? Craig Ruff 2 1,395 01-12-2012, 06:01 PM
Last Post: Craig Ruff
  9100 Keyboard Rebuild (with pics!) David Ramsey 4 2,155 11-08-2011, 05:48 PM
Last Post: David Ramsey
  HP41 battery pack Cristian Arezzini 1 1,361 11-07-2011, 06:36 AM
Last Post: Ignazio Cara (Italy)
  HP-19c battery pack replacement (again...) Xavier A. (Brazil) 8 2,876 09-22-2011, 04:41 PM
Last Post: Xavier A. (Brazil)

Forum Jump: