Re: There is no such thing as a "non replaceable battery"
That's what I thought when attempting to replace the RTC battery on an old camera which was soldered to the motherboard. Nobody seems to sell small enough horizontal pcb-mount rechargeable button-cell batteries to the general public any more.
What I said when subsequently finding a spot on the motherboard well away from the terminals of what I though was a safely discharged flash capacitor is another story. And unprintable.