Many people will know by now what a drama it was with all the Amigas that had an Onboard Battery Backed Up Clock.
The Varta batteries all started leaking after about 10 years, and the pus coming out of those batteries was a real drama for the components and PCB in the immediate vicinity of the battery.
Many Amiga's of people who did not know that have died, luckily I was there in plenty of time.
And if you, like me, have removed the battery in time, then you now have a clock that no longer runs. With the battery removed, the clock does not keep time, but in most cases does not run either.
You can replace the battery in several ways:
New comparable battery (you have to replace it every 5-10 years because otherwise it will leak again) (Desoldering and soldering again and again.
Rechargeable button cell (ML2032), additional circuit required.
Button cell battery (CR2032), you need to replace it every 2 -3 years, but the chance that it will leak is very small (Once the adapter is placed, replacing the button cell is very easy).
A CR2032 battery requires a small additional circuit!
Since you are NOT allowed to charge this battery, you need an additional circuit for this.
The Amiga will recharge the battery during use, and that is not wise for a CR2032.
This replacement battery adapter has a circuit of a Diode (which blocks the current direction from Amiga to battery, and the other way around allows the current to pass to the Clock circuit.
Furthermore, there is a resistor in the circuit that provides further protection when the diode fails.
The original Varta battery that was used in the Amiga is 3.6 volts, a CR2032 is only 3 volts (and with the loss due to the circuit only 2.6 - 2.7 volts)
The most common Clock chips have a working range of 2 - 7 volts, so the button cell has more than enough voltage to make the clock work without problems.
From now on, the Battery adapter is available including CR2032 and costs 4 euros.
This adapter will Fit :
Commodore A501 RAM expansion
Commodore Amiga 500 Plus
Commodore Amiga 1500
Commodore Amiga 2000
And presumably also in (not confirmed)
Commodore Amiga 3000
Commodore Amiga 3000T
Commodore Amiga 4000
Commodore A2386SX bridge board