Over time, this thermal stress causes:
The PBM27A‑210 stepper motor appears in two notable environments, each demanding different performance characteristics. pbm27a-210-mv--r diagram
The TH pin is there for protection, but frequently hitting high-temp cutoffs will degrade the Li-ion cells faster over time. Over time, this thermal stress causes: The PBM27A‑210
Dust and debris on the B+ or ID pins can lead to "ghost" errors where the charger refuses to start. pbm27a-210-mv--r diagram