Hi Dale. ?
the battery for that PCB is a SMD (Surface mount type) CR2032 battery and holder with side positive clip (positive is towards the top of the PCB. ?That¡¯s if it¡¯s defiantly that version PCB as in the Picture. ? ?It¡¯s unusual to remove it. ?No idea why.?
Later Gemini1s used a CR2354 (thru hole ) battery and holder ?it is slightly bigger and has far greater capacity ? ?But this is a thru hole pins (with top of holder is a spring finger clip) ?for positive ?(+ve). ? You can modify your PCB and fit one of these to the earlier version (SMD Battery holder types). ?it will just fit but you need to drill holes and run leads to the original battery pads (and glue down the holder). ? But because of this top finger design I¡¯d not recommend this holder. ?Why? ??
There is battery another ?similar dimensions to CR2354 called CR2450. ? They share the same thru hole pin spacing but the holder is slightly larger by 1mm. ? The CR2450 has greater battery capacity over the CR2354 and CR2932 ?
Oh I should say you cannot fit a larger SMD type holder (ie a CR2354 SMD Battery holder) as the pads are all wrong position ? ?So are thru hole battery holders. ?
But as said you can run small wires to the old pads ?
There is also another thru hole battery holder use on G2s called CR2450 and it to has side positive clip (like the SMD version) and is thru hole as well with same pin spacing as the CR2354.
I have modified old SMD G1 PCB like you have shown. ?You can just fit this type of holder CR2450, glue it down and run ?new pads to the older existing SMD pads ? ?It takes a little work but this battery will last close to 3 yrs on a G1 vs around 10months the to 1 yr for the CR2032 battery type ?
Why fit the CR2450 holder? ? It has a side positive clip so replacing batteries puts less stress on the holder if it¡¯s glued down ? ?As said I do this to older SMD battery holders as it¡¯s just sensible and give far more battery backup capacity ?
You can do it or send to your local repairer, . ? ?As for why the holder was removed? ?They do get damaged?
Don¡¯t, fuss about the 39k resistor mod it¡¯s only needed if the CMOS battery Idraw is 20micro amps or more I¡¯ve only see one needed it ? This was a very early G1!
So either fit a new CR2302 SMD battery holder and battery ? ?Or modify using the holders and batteries I mentioned. ?But you need accurate work it¡¯s a close fit and don¡¯t drill thru any tracks or wrong place.?
Any more info needed fire away
cheers
--
Brendan
