From Traxxas:
The new #2938X Traxxas Balance Lead Adapter makes it easy to connect Traxxas iD batteries to accessory cell voltage checkers. The adapter is compatible with 2s, 3s, and 4s Traxxas iD LiPo batteries.
NOTE: Do not attempt to use the #2938X adapter for charging or any purpose other than adapting Traxxas iD batteries to accessory cell voltage checker
#2938X – $12.00
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