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How do i convert 4 AA batteries to output 9v?

i need 4 AA batteries to output 9v for lego mindstorms
i can only use 4 AA batteries and i cant use 9v batteries either

you will have to get into voltage doubler circuits if you want to do that in series you will only be able to get 6 volts from what you have, hope you don't need much current..

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Rare LEGO 9 Volt Battery Box 2847 Electric 9v Technic Mindstorms 1990's sets    £1.10

Rare LEGO 9 Volt Battery Box 2847 Electric 9v Technic Mindstorms 1990's sets    £.99

LEGO 9v BATTERY BOX 2847c01 * CHEAPEST ON EBAY! * Electric Technic Mindstorms    £9.95

LEGO Technic Mindstorms Power Functions 9V Battery + Medium Motor FULLY TESTED    £16.99

LEGO Technic Mindstorms Power Functions 9V Battery + Medium Motor FULLY TESTED    £14.99

LEGO Technic Mindstorms Power Functions 9V - Motor Battery Lights Switch - VGC    £27.99

LEGO Technic Mindstorms 4.5V Electrical Switch Remote Control Battery - VGC RARE    £29.99

Lego Technic/Mindstorms/Power Functions 9v Battery Pack/Controller 8881    £5.95

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Mindstorms NXT Li-ion battery unpacking