Detailed NiMH pack design for water-quality buoys: sizing cells for 7+ overcast days, series/parallel configuration for 12 V-style rails, capacitor reservoirs for pump and radio pulses, marine charge control, corrosion-resistant construction and redundancy.
How floating water-quality and hydrology buoys manage power: photovoltaic harvesting, multi-day overcast autonomy, periodic sonde excitation and pump/cleaner bursts plus 4G/LoRa uploads, and why a sealed rechargeable NiMH buffer suits the cyclic marine duty.
A design guide to NiMH-powered harvesting sensor nodes: sizing capacity to worst-season darkness, choosing cell format and series count, adding a capacitor reservoir for 50-150 mA radio pulses, charging from weak intermittent PV, low-self-discharge grades and cold-weather derating.
A load-profile analysis of wireless environmental sensor nodes: microamp sleep, milliamp sampling and 50-150 mA LPWAN transmit pulses, why the radio burst dominates energy and voltage design, and where rechargeable NiMH fits against primary lithium in maintainable, energy-harvesting deployments.
A synthesis research roadmap for NiMH charging: unresolved mechanisms and measurement gaps, adaptive/optimal and digital-twin control, materials-enabled fast charge, application frontiers from HEVs to stationary storage, and priorities for cell-charger co-research.
Systematic comparison of charge control for NiMH, NiCd and Li-ion: termination physics, controlled variable, fast-charge limits, maintenance, safety and charger compatibility - explaining why one charger cannot safely serve all three.
Design of accelerated and factorial cycle-life tests for NiMH charge protocols: stress factors, Arrhenius acceleration, control groups, capacity/resistance endpoints, statistical sample sizing, and avoiding misleading life predictions.
