NintendoAge http://nintendoage.com/forum/ -Sqooner [Tech] Replaced a Battery Without Losing my Save http://nintendoage.com/forum/messageview.cfm?catid=22&threadid=133957 2016-08-08T14:19:52 -05.00 MrPete1985 23 Replaced a Battery Without Losing my Save http://nintendoage.com/forum/messageview.cfm?catid=22&threadid=133957 2016-07-31T08:36:08 -05.00 MrPete1985 23 Replaced a Battery Without Losing my Save http://nintendoage.com/forum/messageview.cfm?catid=22&threadid=133957 2016-07-30T22:04:44 -05.00 MrPete1985 23 Replaced a Battery Without Losing my Save http://nintendoage.com/forum/messageview.cfm?catid=22&threadid=133957 2016-07-30T18:18:09 -05.00 MrPete1985 23 Originally posted by: Memblers
 
Originally posted by: Nesmaniac

Could one not just solder a CR2032 holder on back side with wires and leave the old battery in place while having the new one as well and all be ok since it would be parallel and still getting the same 3V? I'm going to find out soon. I just replaced a zelda 2 one but took old one out but on a old copy of zelda I'm going to try what I mentioned & see if it keeps my old saves and keeps working.

Temporarily, while changing the battery, may be OK (I'm thinking under a minute or so).  But leaving it on there will have current flowing from the higher voltage battery into the lower one.  Basically charging a non-rechargable battery, not good. The other issue is that attaching it requires heat which increases resistance. Too much resistance = loss of conductivity and the resulting SRAM data.  

A test clip for the SRAM chip would be pretty cool.   An old game copier would make quick work of it, as would a Retrode or something newer. I've heard of people using a Retron 5 to backup their saves as well. If the INL programmer/dumper had the right pin spacing I would try to turn it into a power source for inserted SNES carts. I have a dead SNES that I'll salvage the connector and 7805 from if I can't fix it and then I could make something tailor-made for powering the cart while swapping the battery. ]]> Replaced a Battery Without Losing my Save http://nintendoage.com/forum/messageview.cfm?catid=22&threadid=133957 2016-07-30T18:04:54 -05.00 MrPete1985 23 Originally posted by: Nesmaniac

Could one not just solder a CR2032 holder on back side with wires and leave the old battery in place while having the new one as well and all be ok since it would be parallel and still getting the same 3V? I'm going to find out soon. I just replaced a zelda 2 one but took old one out but on a old copy of zelda I'm going to try what I mentioned & see if it keeps my old saves and keeps working.
Temporarily, while changing the battery, may be OK (I'm thinking under a minute or so).  But leaving it on there will have current flowing from the higher voltage battery into the lower one.  Basically charging a non-rechargable battery, not good. ]]> Replaced a Battery Without Losing my Save http://nintendoage.com/forum/messageview.cfm?catid=22&threadid=133957 2016-07-29T12:56:16 -05.00 MrPete1985 23 Replaced a Battery Without Losing my Save http://nintendoage.com/forum/messageview.cfm?catid=22&threadid=133957 2014-11-10T04:31:06 -05.00 MrPete1985 23 Replaced a Battery Without Losing my Save http://nintendoage.com/forum/messageview.cfm?catid=22&threadid=133957 2014-09-05T07:28:34 -05.00 MrPete1985 23 Replaced a Battery Without Losing my Save http://nintendoage.com/forum/messageview.cfm?catid=22&threadid=133957 2014-09-05T06:46:08 -05.00 MrPete1985 23 Originally posted by: biocustomconsoles

If you do this you can risk burning up the battery as it's only 3V and not meant to be charged. I use a lipo battery i have as it matches what you are putting in. Lest chance of heating the battery from a charge.

The SNES runs off of 5 volts, all I am doing is giving power to the board while I replace the battery.  this is no more danger to the battery than playing the game on the SNES. ]]> Replaced a Battery Without Losing my Save http://nintendoage.com/forum/messageview.cfm?catid=22&threadid=133957 2014-09-04T23:40:59 -05.00 MrPete1985 23