REACELL AA AAA Battery Charger for NiMH Batteries 1 Hour Quick Charging with Type C USB Input Ports Rechargeable Battery Charger Automatic Shut-Off & Trickle Charging: Amazon.de: Electronics & Photo
NiMH Battery Charger Circuit
Battery Charging NiMH
GP - NiMH technical
Solar Charging Circuit for Onboard NiMH Charging - Project Guidance - Arduino Forum