A4000 Battery & Onboard Fast RAM

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It's eventually happened... my clock is losing hours, sometimes days when switched back on the next day.

So, I'm going to take my A4000 apart this weekend and hack in a lithium battery. I'm going to use the instructions found on Aminet: LithBatt.lha

Has anyone attempted this? I plan to butcher an old PC here at work for the actual battery. Will this be OK?

Next question: Does having Fast RAM on the motherboard slow down the operation of my Amiga? I already have 128Mb on my CyberStorm, should I just leave the Motherboard RAM or get rid of it? It's only 16Mb.

Thanks

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Thanks for the reply MrZammler!!