it will run it slightly faster for a bit longer because off the overvolt charge regime at around 13v and off course because the are newer batteries so holding better voltage and all cells on full voltage
it will buzz like a rampant rabbit or so i am told
knackered as in damages them
or knackered as in flattens them quickly
a 4ah battery will give you around 3.5-4 times the work off a 1.3 ah battery
because your at the higher voltage for longer and at the lower end when it cuts out it far less off battery capacity kept in reserve when it stops dead
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