Home Articles Downloads Forum Products Services EBME Expo Contact
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 4 of 5 1 2 3 4 5
Joined: Nov 2008
Posts: 40
Technologist
Offline
Technologist
Joined: Nov 2008
Posts: 40
For those of you who read my posting about repacking GE DASH monitor Lithium Ion batteries, well it has been a waste of time so far. It would appear that the inbuild battery circuitry can detect and store a decrease in capacity, but not an increase. So I cannot go from 40% back to 100%. At least, not with the rejuvenator I have here in my workshop. I am aware that some circuits can be reset, but the batteries I have here contain Maxim IC's for which I cannot find the relevent data. So its new batteries unfortunately. But not from GE. We have found another source at half their price!

Zachypoo #46529 30/05/10 9:48 PM
Joined: Feb 2004
Posts: 14,678
Likes: 64
Super Hero
OP Offline
Super Hero
Joined: Feb 2004
Posts: 14,678
Likes: 64

So it's good news and bad news, then. frown

But ... regarding the Maxim chips:- no clues emanating from the links provided by Tony Royston at the second page of this thread?


If you don't inspect ... don't expect.
Joined: Nov 2008
Posts: 40
Technologist
Offline
Technologist
Joined: Nov 2008
Posts: 40
Originally Posted By: Geoff Hannis

So it's good news and bad news, then. frown

But ... regarding the Maxim chips:- no clues emanating from the links provided by Tony Royston at the second page of this thread?


Sort of. If the replacement batterys were more expensive I would be tempted to give the PC link circuit thingie a go. But since the difference is not great, I shall stick with replacements rather than getting the old ones repacked.

Zachypoo #46545 31/05/10 6:41 PM
Joined: Feb 2004
Posts: 14,678
Likes: 64
Super Hero
OP Offline
Super Hero
Joined: Feb 2004
Posts: 14,678
Likes: 64

State of Charge, Coulomb Counting ... and all the rest (who said it wasn't fun)? The web is full of this stuff if anyone has the time to research it! But I must report that my own somewhat brief foray did not unearth any mention of that most important "spec":- that of £ per Ah. frown

Notice that the first link mentions the Kalman Filter*.

The second link lays out the case for precise battery monitoring in personal hand-held communications devices. Fair enough. But (as I keep saying) why are we being lumbered with such complexity (and resultant expense) in medical equipment such as patient monitors? frown

The third link discusses some of the finer points to be borne in mind when charging Li-Ion batteries.

Quote:
Of all the common cell chemistries Lithium is the most chemically reactive and the only one which needs electronic battery management systems to keep the battery within a safe operating window and to ensure a long cycle life.

* Which addresses the age-old question:- how do you get accurate information out of inaccurate data?


If you don't inspect ... don't expect.
Joined: Feb 2004
Posts: 14,678
Likes: 64
Super Hero
OP Offline
Super Hero
Joined: Feb 2004
Posts: 14,678
Likes: 64

Originally Posted By: Geoff Hannis

7100's ... Fukuda Denshi's?

Batteries come out at around £ 80 a go, apparently.

More later (when I have time). smile

Have just fitted the new battery. Upon inspection of the old one, it may be interesting to note that the monitoring circuitry (which is relatively complex ... including what looks like a Maxim 1414) is contained (in a nice little plastic box) within the battery pack itself. Again, to my mind it all seems so unnecessary ... especially as the manufacturer recommends that these batteries be replaced annually! frown


If you don't inspect ... don't expect.
Joined: Aug 2007
Posts: 306
Master
Offline
Master
Joined: Aug 2007
Posts: 306
Dont know if you have got this confused but the 7100's are not a smart battery and they last for ages.

Joined: Feb 2004
Posts: 14,678
Likes: 64
Super Hero
OP Offline
Super Hero
Joined: Feb 2004
Posts: 14,678
Likes: 64

Which battery, Billy? The 14.8 V 3800 mAh Li-ion? P/N T4UR18650F-2-4644*. Completely dead. The manual says one year, or 300 charge-discharge cycles.

It might not appear to be a "smart" type as you can simply exchange it (without any "cal" procedure, etc.), but the battery pack does contain all the gubbins I've mentioned. Plug 'n' Play? smile

* Although the manual says ...4664, which is useful. Fukuda Denshi UK use P/N T4UR18650F (which is fair enough).


If you don't inspect ... don't expect.
Joined: Jul 2002
Posts: 2,020
Hero
Offline
Hero
Joined: Jul 2002
Posts: 2,020
Do the batteries really need changing after 1 year. It seems to be a very short life for a battery.
Those who use nitric oxide will know of the cell with a built in timer for obsolescence which you must change yearly even though the thing seems to be working correctly.

Has anyone seen the latest thing from Draeger where the consumables on their anaesthetic machines are chipped so they have to be changed at the correct interval and I presume you cannot get copy parts. It ensures patient safety by correct operation of the equipment....oh and sales as well.

Adding intelligence to things does seem to have a down side.
Or an up side depends on whether you are buying or selling.

Yours, as cynical as ever

Robert


My spelling is not bad. I am typing this on a Medigenic keyboard and I blame that for all my typos.
RoJo #46596 02/06/10 3:38 PM
Joined: Feb 2004
Posts: 14,678
Likes: 64
Super Hero
OP Offline
Super Hero
Joined: Feb 2004
Posts: 14,678
Likes: 64

Then, next thing you know, they announce that such-and-such bit of kit shall "no longer be supported" from such-and-such a date. frown

All this only serves to remind us (me, whomever) that we have to keep on, er, fighting!

In reality it has nothing to do with patient safety. That's just the "frightener". But everything to do with revenue streams ... and gouging!


If you don't inspect ... don't expect.
Joined: Jul 2005
Posts: 601
Philosopher
Offline
Philosopher
Joined: Jul 2005
Posts: 601
You got there eventually Geoff. It's all about the gouge!!!

Page 4 of 5 1 2 3 4 5

Moderated by  DaveC in Oz, RoJo 

Link Copied to Clipboard
Who's Online Now
5 members (vitapablo, Dustcap, Neoteny, Huw, 1 invisible), 751 guests, and 372 robots.
Key: Admin, Global Mod, Mod
Newest Members
Martin33, Bhavik patel, Kingsley, SB Biomed, Marc Dev
10,194 Registered Users
Forum Statistics
Forums25
Topics11,077
Posts73,800
Members10,193
Most Online5,980
Jan 29th, 2020
Powered by UBB.threads™ PHP Forum Software 7.7.5