Replacement Toshiba 440CDX Laptop RTC/CMOS Battery? - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: January 20, 2017, 12:58:32 am
content: I'm after some advice. I need two new NiMh battery packs for a (very) old laptop (see attachments). The smaller one marked 'Varta 3/V30H' keeps the RTC ticking and retains CMOS settings. The larger one marked 'Varta 6/V110H' is the battery backed RAM for suspend/resume operations (which I'm not too worried about).I've done a quick Google and checked Element14 and they don't seem to stock this type of pack. Not sure if it was a standard Varta part or something custom made by Toshiba. Does anyone have any ideas where I can get a new one or a suitable non-Varta replacement? (Not interested in "New old stock" from eBay.)Failing that, does anyone have the capability to spot weld and recreate one of these packs using the existing cable/connector that can help me out, preferably in Australia?

author: Halcyon
author_rank: Unknown
timestamp: January 20, 2017, 01:08:42 am
content: Quote from: wilfred on January 20, 2017, 01:03:45 amThe space is at a premium in there. The cover (which is removed in the photos) is where the palm rest/mouse buttons are. I could remove the suspend/resume battery altogether as I'm not using that feature, however it would be nice to keep it in as original condition as possible.

author: Halcyon
author_rank: Unknown
timestamp: January 20, 2017, 02:58:13 am
content: Quote from: wilfred on January 20, 2017, 01:57:44 amI don't use it for anything serious, it's just part of my old computer collection but it's in fantastic condition, almost like it just came out of the box.

author: amyk
author_rank: Super Contributor
timestamp: January 20, 2017, 03:47:12 am
content: The big one is a 6S pack of 1.2V 110mAh NiMH cells. Looking around, it seems the 110mAh has been discontinued and replaced by the 150mAh V150H:http://www.varta-microbattery.com/applications/mb_data/documents/data_sheets/DS55615.PDFhttps://cellpacksolutions.co.uk/products/batteries/varta-v150h-rechargeable-button-cell-battery/The small one is a 3S pack of 30mAh cells, V30H which seem to still be available.http://www.varta-microbattery.com/applications/mb_data/documents/data_sheets/DS55603.pdf

author: samnmax
author_rank: Regular Contributor
timestamp: January 20, 2017, 08:28:31 am
content: Are you sure you want to replace the battery? I've had some corrosion problems with a similar Toshiba laptop (220CS, I think). The negative cable had that green corrosion up to the connector on the mainboard. I just removed both batteries and just enter the time and CMOS data the seldom times it is powered up.

author: Halcyon
author_rank: Unknown
timestamp: January 20, 2017, 09:59:57 am
content: Quote from: samnmax on January 20, 2017, 08:28:31 amThe batteries hold a charge for a matter of weeks, but not months. So there is still some capacity left in them. Ideally I'd like to replace them before they totally crap out and/or leak. Call it preventative maintenance if you like.Mind you, the original main battery still lasts over an hour on a charge. Not bad for something this old

author: samnmax
author_rank: Regular Contributor
timestamp: January 20, 2017, 01:04:24 pm
content: Quote from: Halcyon on January 20, 2017, 09:59:57 amHaha, yes, I think my 220CS (Pentium 133!) still holds some charge in the main lithium battery. That must be because they are Li-Ion batteries ,otherwise NiMH or Nicd would be dead by now.

author: Halcyon
author_rank: Unknown
timestamp: January 20, 2017, 10:15:14 pm
content: Quote from: samnmax on January 20, 2017, 01:04:24 pmI think you're right. The one in my machine is a lithium pack. Also looking at the bottom of the unit it has "Made in Japan" -- All the best stuff is made in Japan! :-)

author: walli1000
author_rank: Newbie
timestamp: February 15, 2025, 10:29:09 am
content: Hello Halcyon,find your post again after many years, your technical details for the CMOS-battery helped me a lot, did you find a satisfying solution in the meantime?CU

author: Halcyon
author_rank: Unknown
timestamp: February 17, 2025, 12:14:32 am
content: Quote from: walli1000 on February 15, 2025, 10:29:09 amI have not, I shelved the project and haven't come back to it.

author: MrMobodies
author_rank: Super Contributor
timestamp: February 17, 2025, 01:39:15 am
content: I am pretty sure I got one of those somewhere.Yes I have.Unfortunately the larger one measures 0.800vand the smaller one 0.007v.What a shame. I was given some junk and old laptops in 2010 and I think I pulled those out of a dead Toshiba that I scrapped for parts.

author: Kean
author_rank: Unknown
timestamp: February 17, 2025, 09:26:06 am
content: Quote from: Halcyon on February 17, 2025, 12:14:32 amWell as Halcyon knows, I can build replacement packs for him... but it might take me a couple of years to get around to it...I do hope that the batteries were not left plugged in all this time. There is some nasty corrosion starting on the smaller battery connector in the 2nd photo (top post).