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crwdns2944351:0crwdnd2944351:0Building a Battery Adaptercrwdnd2944351:0crwdne2944351:0

crwdns2933797:0Jim Choucrwdnd2933797:0crwdne2933797:0

crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Jim Chou

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Nielsen-Kellerman CoxBox
Type
technique
Title
Building a Battery Adapter
Introduction
The original battery pack is an 11.1v 2600 mAH battery pack with three wires. It was not currently in production according to the manufacturer, and not in stock at distributers like Digikey or others found through Octopart.
Replacing the battery with a two-wire battery pack does not work - the CoxBox electronics reads the thermistor attached to the middle and ground wires and if the thermistor is not present thinks the battery is too cold to charge.
In order for the CoxBox to function properly it needs a three-wire pack. Unfortunately, I was unable to find one, probably because most of the battery management systems (BMSes) in the current packs handle temperature control internally so just expose the power leads. To remedy this problem, a 10K negative temperature coefficient (NTC) thermistor is needed to provide the appropriate resistance to the CoxBox.
Time Required Min
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Time Required Max
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Difficulty
Moderate
Conclusion
To reassemble your device, follow these instructions in reverse order.
Author
Jim Chou
Public
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  • In Progress added.
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