For a little robot project i need a replacement powersupply, i've already read some documentation on the subject but i could really use the input.
Size and weight are limited.
The original power design:
4 lr14 c type Alcaline 1,5v batteries
Robot only needs 6v to operate
About 270 Gram
But now i need 5v(AVR/Zigbee), 6v(toy itself), 9v(addon) and i need the design to be recharchable.
I've got a new 6 cell 10,8 lion Laptop battery (300 Gram) and would like to use this as a powersupply.
The current for the 6v system is as of yet unknown, but there are about 4 little motors used in it and a small cpu, probably the peak current would be about 1A.
The current for the 9v system is about 100 mA .
1. What would be the best way to generate the 5v/6v and the 9v from the 10,8v battery.
I would guess that a normal 780x would be a waste of current, anybody have any ideas for a LDO or something?.
2. Would the original electronics contained in the battery pack add something or could i just tear it out and use an existing external 2 lead Lion charger, do i need to take other precautions?
Does it level the batteries?
3. How can I best cut of the power completly if the battery's are almost empty?
p.s. edited the title for clarification LOL