Lithum Ion battery packs

[Brian Gregory [UK]]

What would it take to make a dummy lithium ion battery pack for a
lap-top computer which is only going to be used in a boat?

The battery pack would have to appear to be fully charged so that power
from the boat battery would never be wasted charging it.

I know nothing about these battery packs - they often appear to have
more than 2 connections but maybe this is just redundancy or to allow
accurate voltage measurement even with contact resistance. Anyone here
know?

--

Brian Gregory (In the UK).
ng@bgdsv.co.uk
To email me remove the letter vee.

 

[CampinGazz]

"Brian Gregory [UK]" <ng@bgdsv.co.uk> wrote in message
news:408fe8fb$0$25327$cc9e4d1f@news-text.dial.pipex.com...

What would it take to make a dummy lithium ion battery pack for a
lap-top computer which is only going to be used in a boat?

The battery pack would have to appear to be fully charged so that power
from the boat battery would never be wasted charging it.

I know nothing about these battery packs - they often appear to have
more than 2 connections but maybe this is just redundancy or to allow
accurate voltage measurement even with contact resistance. Anyone here
know?

Is there any reason for the dummy battery at all???

i run my laptop without it's battery in my motorhome regulary, the reason
for doing this is partly the same as yours, to not waste power charging the
battery, it takes an extra 3 amps if using an inverter and the internal
battery is being charged,

so i just remove the battery pack, and i'm pulling under 1.5 amps in normal
conditions.. this is using an inverter and the laptops psu, as my laptop
wants 18 volts to run.

However my laptop will run from 12 volts DC directly with the battery pack
removed, and as the battery pack died a year ago, and i'm too stingy to pay
the Ł150 the maker wants for a new one, so i run the laptop in the motorhome
all the time straight off 12 volts.

note not all laptops will run off 12 volts directly, but some do, it's a
case of suck it and see, it's certianly more power efficiant if it will than
using an inverter or dc to dc converter to power it.