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Thermistor for NiCd battery pack.

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paul8f:
Hi all,

just figured out why this cheap old branch-cutter is failing to charge. The thermal sensor is reading in the k \$\Omega\$ range.
The (8s) NiCd pack will accept a charge when this is bypassed. I'm guessing it's an NTC thermistor???

Any ideas what type it is, and where I could pick up a replacement? Code starts with JJ I think.
(specs & photos attached).
Paul.



beanflying:
Depending on how it is wired it will be a NO or NC one of these eBay auction: #132678371472 go with 60C will be safe but allow a good charge rate or even just drop it out of the circuit by opening or bridging as needed.

They were always just a belts and braces with Nicads and all my R/C packs would never have anything like it used or fitted.

mikerj:
The JJD-45 thermal switch opens at a nominal 45C.

beanflying:

--- Quote from: mikerj on May 04, 2021, 08:15:43 am ---The JJD-45 thermal switch opens at a nominal 45C.

--- End quote ---

45C would be a likely fail in an Aussie Summer for charging, should be OK for an Irish heatwave  ;)

paul8f:

--- Quote from: mikerj on May 04, 2021, 08:15:43 am ---The JJD-45 thermal switch opens at a nominal 45C.

--- End quote ---
That looks about right. Thanks for the post!

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