I am looking to put together a simple external battery pack for a small laptop I have.
The external power supply puts out 19 VDC and it is this port that I want to bring my battery power in through (i.e. I am not looking to replace or run parallel to the laptop battery). My thought is to use 12 Alkaline 'D' cells in series to give me 18V.
So my question is: Is the fact that I am 1V low a problem? Is the voltage drop off going to be an issue or is this going to be good until the batteries are pretty much done?
Alternately, I can get 19.2V from 16 rechargeables. I'm pretty sure this will work but I am not sure what I am going to need to recharge this. I am assuming that my charger that does 4 NMH AA cells won't have the power to do 16 D cells.
I am trying to avoid any electronics if I can (i.e. keeping it very simple) but I do not want to risk the laptop at all.
Anyway, this is not my area of expertise so I am hoping that someone can give me some advise to let me know if this is reasonable or if I am way off base.
Thanks,
Dave
The external power supply puts out 19 VDC and it is this port that I want to bring my battery power in through (i.e. I am not looking to replace or run parallel to the laptop battery). My thought is to use 12 Alkaline 'D' cells in series to give me 18V.
So my question is: Is the fact that I am 1V low a problem? Is the voltage drop off going to be an issue or is this going to be good until the batteries are pretty much done?
Alternately, I can get 19.2V from 16 rechargeables. I'm pretty sure this will work but I am not sure what I am going to need to recharge this. I am assuming that my charger that does 4 NMH AA cells won't have the power to do 16 D cells.
I am trying to avoid any electronics if I can (i.e. keeping it very simple) but I do not want to risk the laptop at all.
Anyway, this is not my area of expertise so I am hoping that someone can give me some advise to let me know if this is reasonable or if I am way off base.
Thanks,
Dave