2.4volt battery inside of PSU ??? - Page 1
Forum section: electronics / repair

author: SArepairman
author_rank: Frequent Contributor
timestamp: August 25, 2014, 04:12:18 am
content: what the fuck is this shit?http://s29.postimg.org/a8643hovp/DSC_0067.jpghttp://s28.postimg.org/bhob7w3cb/DSC_0066.jpghttp://s30.postimg.org/94svu2tfz/DSC_0065.jpghttp://s8.postimg.org/ch0ua6uk3/DSC_0068.jpgbattery goes herehttp://s27.postimg.org/rxij2y6u9/DSC_0070.jpg

author: SArepairman
author_rank: Frequent Contributor
timestamp: August 25, 2014, 04:30:45 am
content: the battery is located in the AC mains power supply, but it has a long ass trace.. going into the unit... its not connected to anything else as far as I can tell...

author: SArepairman
author_rank: Frequent Contributor
timestamp: August 25, 2014, 04:46:06 am
content: i wonder if its possible to hook up a bench supply to substitute for this battery..what kind of a monster would put it in the god damn power supply of all places. can't it be next to whatever its supposed to power?

author: David Hess
author_rank: Super Contributor
timestamp: August 25, 2014, 06:03:29 am
content: It is probably for some type of memory backup supply. Maybe there was a regulatory requirement that placed the battery into the power supply.

author: PlainName
author_rank: Super Contributor
timestamp: August 28, 2014, 10:44:53 pm
content: QuoteCan't see the photos (can you bung them on the board, or use a proper hosting?) but a power supply seems a pretty decent place for supplying power to me. Many advantages over embedding a battery on the PCB - you mention one yourself when you say "i wonder if its possible to hook up a bench supply to substitute for this battery".[Re-reads]Sorry, that might not make much sense to you. Here's a translation:"Can't see the stupid photos (WTF?!? Use a proper god damn host) but a fucking power supply supplies the fucking power you know. The idea isn't complete shit."

author: SArepairman
author_rank: Frequent Contributor
timestamp: August 29, 2014, 04:00:53 am
content: i think ~20 locktite bound screws and some difficult & tricky to remove molex connectors (brute force fitted), glued down foam (again, who uses foam to direct air flow???), would beg to differ. You can't even put it back together without adhesive! All to change a fucking batteryWhoever put the battery there is a complete dick head. It's not like space is difficult to find in this thing.

author: PlainName
author_rank: Super Contributor
timestamp: August 29, 2014, 09:54:29 am
content: QuoteI might agree if I could see that, but since I can't view the photos...

author: David Hess
author_rank: Super Contributor
timestamp: August 29, 2014, 02:14:09 pm
content: Quote from: SArepairman on August 29, 2014, 04:00:53 amI have similar thoughts about designs that use and especially store critical calibration or option data in non-volatile SRAM which has an embedded lithium cell. The justification I usually hear is that the battery lifetime exceeds the product design lifetime but I suspect the more important reason is that the product was intended from the beginning to self destruct after a period of time. If that was not the case, then they would include some means for the user to backup and restore the contents.I hear a similar justification when nVidia or Broadcom or anybody else says they cannot release design documentation because of IP agreements. I suspect any IP agreements they made were deliberately used to create that excuse from the start.