You need to do the starter / GP upgrade. I put the $90 China starter and new GP's on my 882 and I starts fast now with a regular lawn & garden battery. I have not done a D640 yet but I'm thinking the parts should be the same. There is a "How to" for the D600 in the tech section. My starter came from a company in Georgia on epay and I think the GP's were $7 each at my local auto parts store. It's a good Saturday project for about $125.
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