Brooke, I priced Ni-Cds and was not happy with the numbers: a set of 20
D-size cells will cost me ~US$100 by the time I get them delivered. That
plus the 8-pound weight penalty makes replacement Ni-Cd cells
unattractive. (105A = 16 pounds, 105B = 24 pounds including the battery
box and charging circuitry) There is no question that Ni-Cds are the
answer for anyone attempting to restore a 105B for competition in the
neighborhood Concours d'Elegance.
I do appreciate your work on the relative merits of the various Lithium
types. I was afraid the existing charge circuitry in the 105B would not
mate well with Lithium-anything batteries. Having twice set the house
afire through assorted misadventures (thank goodness for smoke alarms
and fire extinguishers), I don't want to try for "Number 3".
Jeremy
On 9/15/2016 9:59 AM, Brooke Clarke wrote:
Hi Jeremy:
I'm currently having fun playing with various rechargeable battery
related stuff which includes Li-Ion cells.
http://www.prc68.com/I/BatTst.shtml#Resistor
The cells come in three configurations:
1. the raw flat top cell with optional tabs to allow easy soldering
into a pack,
2. cell plus positive button cap which includes a Positive Temperature
Coefficient (PTC) fuse and an over pressure vent,
3. fully protected, like 2, plus circuit that turns off the battery if
charging and over voltage or loaded and under voltage. On these you
can feel a wire/ribbon running from positive to negative under the
shrink wrap and they are slightly longer.
These configurations are independent of the flavor of Li chemistry.
To go with any of the above you need a charger specific to the
particular Li chemistry (the charging voltage is not the same) and if
a pack you also need a either cells like 3 above or a protection
circuit for the pack. For optimum performance in addition a tap
between each virtual cell (made of of parallel cells) so that the
charge can be balanced and a charger that can do that. This is not
easy, witness the current recall of the Galaxy Note 7s phones.
I would just use modern Ni-Cad cells mainly because of the ease of
charging and maintaining them and use the existing charging circuitry.
Li chemistry has advantages for portable equipment, but not so much
for rack mounted equipment.
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