Scott, Jonathan B.Mohri, HiroshiBonnett, BlairHayes, Michael2017-12-062017-12-012017-12-062017Scott, J. B., & Mohri, H. (2017). Cross-Needle Analog Meter to Monitor Charge Time for Lithium-Ion Single Cell. Presented at the ENZCon 2017, Christchurch, New Zealand, 4-6 December 2017.https://hdl.handle.net/10289/11550This manuscript describes a novel cross-needle analogmeter whose scale reads out voltage, current, and time remaining to reach full charge. The design is inspired by cross-needle Standing Wave Ratio(SWR) meters that read forward and reverse power. Voltage is displayed on an offset-zero linear scale, and current on a logarithmic scale from 1 mA to 10 A. Thisleads to a wide range of perceptible charge times and pleasantcharge-time contour lines. The prototype is implemented on a single PCB using a cheap PIC micro controller. It is scaled formonitoring a single 18650 lithium cell charged by a small solarpanel. The Novel contribution of this paper is the use of a crossneedleanalog meter with a third scale to measure time remaining to fully charge a Lithium-Ion single cell battery.application/pdfen© 2017 copyright with the authors.Conference Contribution