BATTERY BACKUP with charging (will not trigger arduino reset)

Hi.. Thanks for the tips. The tip about sharing current between the 7805 and the tip32b is definitely going into my bag of tricks. Thats a biggy.. thanks again.

  1. If you remove SPST relay and diode with question mark you get a reset on power off.

Anyway, Im moving over to 12v 4amp hour batteries to arrive at a 5-6 hour battery on time. Considering my projects draws .25 amps at power off these 12v batteries should do the job. Lets see.. 4 (amp hours) / .25 amp = 8 hours.. something tells me it doesnt work that way.. but well see. I just hooked up a .26 amp fan to one of these 12v batteries