Power Drill Battery Rebuild by Terry Byland

Discuss caving lights, packs, helmets, clothing, etc.
For rope and vertical equipment, go to the On Rope! forum.
Cave electronics enthusiasts can also visit the Communications and Electronics Section forum.

Moderator: Moderators

Power Drill Battery Rebuild by Terry Byland

Postby cavescom » Feb 9, 2007 6:09 pm

Terry Byland sent me this article....feel free to forward to other cave groups. Power Drill Battery Rebuild http://docs.google.com/View?docid=dd7k4njz_3g26482 or http://tinyurl.com/2khfms

Mark Passerby, Caves.com
User avatar
cavescom
Prolific Poster
 
Posts: 195
Joined: Sep 19, 2005 9:09 pm
Location: Michigan
  

Postby tagcaving » Feb 10, 2007 12:15 am

Thanks a lot for that! I am also building a new battery pack for my Hilti 36v drill. Ordered the batteries last week. I plan put up a build page of the project and share it.

The original Hilti NiCd pack was just 1200mah and had a cut off of 85% charge so I only got 37wh out it and maybe 20 bolts on a charge. It weighed 5 pounds. The new pack will be made 10s3p from 18650 2200mah lithium ion cells. 244wh and enough power to set 100 bolts or drill 14 feet of 5/16 hole for rock shaving. Just 3 pounds and $166. An alternative is using A123 Li Phosphate or Emoli 3000mah 10c cells. The advantage being A123 will not explode and burn down you house if you mistreat them. Mistreat Lithium ion cells and kaboom....

Cells are made in 5 2s3p 7.4v blocks, shrink wrapped, tool dipped, and covered in a fiber glass shell, then tool dipped once more. The 5 packs are then put on a belt and hooked in series. Each pack is charged separate with one charger at 1C, so just 2 hours a pack. That takes 10 hours to do 5, but not a problem the week before a trip.

No PCB so a 14A poly switch is used to protect each pack from shorts. A low voltage cut off set for 30 volts to limit discharge to 3 volts per cell is a good thing also.
To The Bitter End,
Andy Porter, 26258FERL

Image
User avatar
tagcaving
Occasional Poster
 
Posts: 39
Joined: Feb 8, 2007 1:46 pm
Location: Georgia
  

Postby Scott McCrea » Feb 10, 2007 8:12 am

Is anyone else having trouble getting the images at the link above to load, or is it just me?
Scott McCrea
SWAYGO
User avatar
Scott McCrea
Global Moderator
 
Posts: 3198
Joined: Sep 5, 2005 3:07 pm
Location: Asheville, NC USA
NSS #: 40839RL
Primary Grotto Affiliation: Flittermouse Grotto
  

Postby barcelonacvr » Feb 10, 2007 8:59 am

Scott McCrea wrote:Is anyone else having trouble getting the images at the link above to load, or is it just me?


All I see are x's too.
barcelonacvr
NSS Hall Of Fame Poster
 
Posts: 312
Joined: Oct 26, 2005 5:23 pm
  

Postby cavescom » Feb 11, 2007 4:46 pm

Here is a link to a PDF version of the "Power Drill Battery Rebuild" by Terry Byland. http://www.caves.com/batteryrebuild.pdf

Mark Passerby, Caves.com
User avatar
cavescom
Prolific Poster
 
Posts: 195
Joined: Sep 19, 2005 9:09 pm
Location: Michigan
  


Return to Equipment Forum

Who is online

Users browsing this forum: No registered users