9Ah battery?
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Electrical installation
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Milwaukee have released a 9Ah high end battery on to the market for early next year, Has Bosch any plans to do something similar?
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1976
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Electrical installation
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Their 9 amp battery is really just 1 1/2 standard battery packs moulded into a single casing (i.e. 15 cells) & wired in parallel.  Bigger, heavier, less capacity and a LOT less convenient than 2 standard packs in my opinion.

What's wrong with what you have already?  For more grunt & charge longevity get a mains powered equivalent.