few questions about 7 led china lights

OK i am experimenting with a set of them cheap china 7 led horn/lights etc i took the thing apart as you can see
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OK the brake (3 lights)and taillight (1 light)as shown the brake lights work ok but not that bright cannot see them from a big distance ,

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the turn lights are rubbish i cannot see them in day and not bright at night at all they run on 2 AA battery's (3 volts)

OK
1/can i add 2 more battery's to make a 4 battery holder to make 6 volts if so ,will i get bright leds??? (i am a noob with electrics so bare with me)

or
2/ can i some how get brighter leds for at least the turn lights so i can see them
i don't know what sort of leds these are but there not that great .

like i said i a noob with electrics i am just messing about trying to get better brighter lights , mainly for the brake and taillights

also i made a brake lever brake light with wires coming out of it that i using for the 7 led lights at the moment now could i use them wires to make something better and if so how would i wire them up .
ty

anyone or am i stuck with this until find a better way that don't need any electrical skills .

ty toadmund is that just for these leds or all , so can buy better leds with better voltage to make them brighter ??

ty toad m8 i check things out see what happens with i was good at electronics i know a lot about gardening but that's no good here heheh