Amazon.com : Solar Power Management Maintainer Module for 6V~24V Solar Panel,Support Solar Panel/USB Connection Battery Charging with MPPT Function and Multi Protection Circuit Suit for Low-Power IoT Project etc : Patio, Lawn
Make a solar battery charger using solar plate voltage booster & TP4056 - KT781 - REES52
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Reference Designs
Electronic Spices 6V-100 MAH (70 x 70 x 03 mm) Mini Solar Panel Square Shape With 5V Boost Step Up Power Module Lithium Battery Charging Protection Board 134N3P : Amazon.in: Garden & Outdoors
Amazon.com: Waveshare Solar Power Management Module for 6V~24V Solar Panel Support Solar Panel/USB Connection Battery Charging with MPPT Function and Multi Protection Circuits : Patio, Lawn & Garden
1A 1.2V 2.4V 3.6V NiMH Battery Dedicated Charger 1.5V 3V 4.5V CC/CV C – Many Favours
Lithium-Ion Battery Charger Circuit using MCP73831