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<div class="moz-cite-prefix">On 11/18/19 6:14 PM, Tadd Torborg via
TriEmbed wrote:<br>
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cite="mid:3e2ebde5-7987-4dcc-b76d-b8af76505bcf@me.com">
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<div>I'm using a 2.5amp-hour 12v Gel Cel - PS-1220 Costs $10 in
quantity 10. </div>
<div><a href="https://www.amazon.com/gp/product/B077Y9FT5K"
moz-do-not-send="true">https://www.amazon.com/gp/product/B077Y9FT5K</a><br
data-mce-bogus="1">
</div>
<div> I'm using it as a backup supply to keep a Raspberry PI alive
if the main 14.2v supply goes away. I have the two main and
battery diode ORed through a bridge rectifier to a DROK switcher
supply which outputs 5.2v on USB to run the Raspberry PI 4B.
Another leg of the bridge rectifier provides 13.8v only from
main supply, which I run through a 10watt 50ohm resistor back to
the +DC lead on the gel cel. This gives me a really cheap
trickle charger. <br>
</div>
</blockquote>
<p>If the battery is warmer than room temp a schottky or regular
diode in series will avoid exceeding the recommended maximum
standby charge voltage. The 13.8 limit is for 25C. Reference <a
moz-do-not-send="true"
href="https://www.powerstream.com/SLA.htm">here</a>.<br>
</p>
<p>Pete </p>
<blockquote type="cite"
cite="mid:3e2ebde5-7987-4dcc-b76d-b8af76505bcf@me.com">
<div><br data-mce-bogus="1">
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<div>Objectives: </div>
<div>1. feed stable power to the Raspberry PI with 5.2v even if
main supply glitches or goes off<br data-mce-bogus="1">
</div>
<div>2. run off a main power supply supply which can also feed
power to 12-15v peripherals<br data-mce-bogus="1">
</div>
<div>3. have backup capability for at least several hours of
running the Raspberry PI 4 and it's daughter cards.<br
data-mce-bogus="1">
</div>
<div>4. be cheap<br data-mce-bogus="1">
</div>
<div>5. be easy to get now and into the future<br
data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div>Details on the trivial circuit are here:<br
data-mce-bogus="1">
</div>
<div><a class="moz-txt-link-freetext" href="http://tarpn.net/t/builder/builders_robust_power_for_raspberry_pi.html">http://tarpn.net/t/builder/builders_robust_power_for_raspberry_pi.html</a></div>
<div><br data-mce-bogus="1">
</div>
<div> Tadd / KA2DEW</div>
<div><br>
On November 18, 2019 at 12:41 PM, Robert Henry via TriEmbed
<a class="moz-txt-link-rfc2396E" href="mailto:triembed@triembed.org"><triembed@triembed.org></a> wrote:<br>
<br>
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<div>(--sending from correct e-mail this time--)<br>
</div>
<div>Hey all,</div>
<div><br>
</div>
<div><b>Question for group</b>: I'm curious what battery
packages folks in this group use for their projects?
If there is quite a variety - perhaps offer your
favorite/most flexible.<br>
</div>
<div><br>
</div>
<div><b>Background:</b> I'm currently selling ~12v
LiFePO4 battery packs (4s1p) that I had as surplus
from a consumer product. Product launched with
limited success, but the battery packs are selling
well enough that I'm considering sourcing other
chemistries / configurations. Would like to keep with
the embedded project market to start (that is -
capacities less than 100 Watt-Hours).</div>
<div><br>
</div>
<div>Any insight would be greatly appreciated. Thank
you!</div>
<div>Rob Henry</div>
<br clear="all">
<div>
<div dir="ltr" class="gmail_signature">
<div dir="ltr">
<div>Rob Henry<br>
</div>
<div>LT Cage Productions, LLC<br>
</div>
ph: +1.919.245.7684<br>
</div>
</div>
</div>
</div>
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