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RE: power tool batteries

Yea, they are using the NiCd batteries because they are cheap and can =
handle fairly high currents (without exploding, melting, or venting =
toxic gas.)  For a wearable you may be better off going with LiIon =
laptop batteries.  Energy Access makes chargers for some of the =
batteries, in particular the batteries used with the old ViA wearables.  =
A good battery to look at is the B-5887LIS from Hi Capacity, it is a =
10.8V 5400mAh LiIon.  (These are the batteries Micron sells as =
replacements for their Transport laptops.)  Throw a switching regulator =
on there with an input range of 9-18V, outputs of +5V and +12V and you =
should be cool.  NiMH is also a good option, but they are heavy compared =
to LiIon.  We've been running NiMH on our wearables for 4 or 5 years.

- Jason W Fox
- Electronics Engineer
- (202) 404-3736
- SPG, ENEWS, Code 5707.56
- Tactical Electronic Warfare Division, Naval Research Lab
- Washington, DC

-----Original Message-----
From: Eugene Nine [mailto:]
Sent: Saturday 26 July 2003 22:14
To: 
Subject: RE: power tool batteries

A lot of the older cordless drills are NiCad batteries which don't have =
the
goot weight/power ratio as NiMH or Lithuim Ion.  I have an old Makita =
9.6v
NiCad that is the long skinny batteries that should be easier to wear =
than
most of the new style that are a big block that attach to the end of the
drill handle.  I have seen that Makita sell a newer drill with the same
battery shape in a 9.6V NiMH setup in the chain hardware stores for =
around
$100.  The price of the kit (drill, charger, battery or 2) is cheaper =
than
buying the components seperatly and the Newer NiMH should be better than =
the
NiCad.
Eugene

-----Original Message-----
From: Jennifer Pellinen [mailto:]
Sent: Saturday, July 26, 2003 9:41 PM
To: 
Subject: power tool batteries

One day I was looking at my cordless drill and was
pondering the use of cordless power tool batteries for
a wearable computer. I know the makita power tools
have an external batery charger. I would assume
batteries and a charger are available seperatly. What
are other peoples thoughts on using these types of
batteries on a wearable computer?

Jennifer Pellinen

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