In summary, the LTC4123 combines a wireless power receiver with a linear NiMH battery charger, functioning as a complete wireless charging receive circuit in a wireless power transfer system. The LTC4123-based rechargeable NiMH cell powered solution offers the best solution by offering a very safe chemical alternative to Zinc-Air batteries with a simple inductor-less single-IC configuration. Key features include up to 25mA programmable charge current, temperature compensated charge voltage, Zn-Air cell battery detection, reverse polarity detection, and compact packaging. Target applications include rechargeable NiMH battery powered hearing aids, small medical instruments, smart cards, wearables including fitness devices, Internet of Things systems, plus moving and/or rotating equipment-based systems.