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(1) What rating would the resistors on the Tapered Charger Circuit need to be, assuming a maximum charge rate?
(2) What would be the optimum charge rate? A two hour charge time would be great but I imagine this comes at the cost of overheating & reduced battery life.
I'd prefer to use DC input for safety. Is it just a matter of chopping out the rectifiier and connecting the DC input to the top (+) and bottom (-) rail? What would be the relevant input voltages / resistor values for DC input?