It is quite common after a few years for A1500's, A2000's and A4000's to have a leaking real-time clock battery. Replace it before it corrodes your Amiga motherboard with this 3.6V surface mounting Ni-MH battery. This barrel battery has three contact legs for connection to the Amiga motherboard. We can replace a leaking battery on your A4000 motherboard - please contact us for a quote.