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Lithium ion is hard to beat for rechargeable tools. We've switched
to Milwaukee M12 tools in the shop and they've been great. I think
NiCd can manage higher currents easier, but the self-discharge rate
is ridiculous.<br>
<br>
I use non-rechargeable lithium metal batteries for anything I'm
going to keep packed away for an emergency. They'll last 20 years
on the shelf and won't leak, and they last 3x as long as alkalines.
I don't use anything else in flashlights anymore.<br>
<br>
Scott<br>
N1VG<br>
<br>
<div class="moz-cite-prefix">On 7/14/2017 3:16 PM, Michael Barnes
wrote:<br>
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cite="mid:CAAthHBZC=WucuerbGusnG70d=A45WnOptGq1htPwyE7qNcPokQ@mail.gmail.com">
<div dir="auto">I have experienced so much grief from NiCd
batteries over the years, I will never use them again if I can
help it. I got a real nice screw gun a couple years ago for
Christmas that has NiCd batteries. Every time I go to use it,
the batteries are dead and I have to wait a couple hours to
charge one. I have a small electric screwdriver with lithium
batteries that was in storage for almost a year. When I unpacked
it, I used it heavily for a week before I had to charge it. It
held its charge all that time in storage. When I can, I'm going
to have my remaining NiCd packs converted to lithium cells.
<div dir="auto"><br>
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<div dir="auto">Michael WA7SKG </div>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Jul 14, 2017 16:14, "Robert
Bruninga" <<a href="mailto:bruninga@usna.edu"
moz-do-not-send="true">bruninga@usna.edu</a>> wrote:<br
type="attribution">
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<div link="#0563C1" vlink="#954F72" lang="EN-US">
<div class="m_-8764603695728902173WordSection1">
<p class="MsoNormal">Lesson relearned on NiCd charging:
Several years ago I made three 12v batteries from D
cell NiCd’s.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">They have been a huge
disappointment. They are only used once or twice a
year on critical field work and always fail far
earlier than estimates. But I always just charge them
the night before with a fixed voltage charge of 14
volts since I most often forget about batteries I put
on charge and end up ruining most of them. Charging
at fixed voltage is safe…</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">For the AT Golden Packet event
tomorrow, last night I left them on my usual 14 volt
overnight charge and they were “fully charged” by
morning, only drawing a 50 mAh each in the morning at
14 volts..</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Put them on a battery analyzer and
their capacities came in at 10%, 8% and 3%. Then the
battery analyzer quick charged them at 1C rate for 1
hour with them getting up to 16 or 18 volts, then a 4
hour equalization charge of 0.1C or 400 mA. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Then it retested them and got 75%,
65% and 85% of rated capacity!</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">So, Apparently little-used NiCd’s
are not going to get a good charge from a FIXED
voltage charge!</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Wish I had time to cycle them two
more times. On batteries at work we see huge
recoveries from little used NiCd’s when “rejuvenated”
which is the 3 cycles of charge and discharge I
started with above.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Bob</p>
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