The main Types of Rechargeable Batteries are NiCd – Lead Acid – NiMH – Lithium ion. The Gel Lead Acid Battery is Termed Maintenance Free and may have to be treated differently for charging.
List of battery sizes – Wikipedia
4.5 Volt – D – C – AA – AAA – 9 Volt – SR41/AG3 – SR44/AG13
Battery Charger Circuits and Resources
- Battery Charger for Gelled Lead Acid
- Solar charger for lead-acid batteries
- 12 Volt Gel Cell Charger
- Temperature Controlled NiCd Charger
- Battery charger 150-1700 mAh with PIC16F876
- Rechargeable Batteries and Chargers
- Typical Rechargeable Flashlight Schematics
- User-Configurable Programmable Lead Acid Battery Charger
- MAX846A Cost-Saving, Multichemistry, Battery Charge Chip
- High Efficiency Switch Mode Li-Ion Battery Charger
- LM3622 – Lithium-Ion Battery Charger Controller
- TI – Quick Search Selection Tool – Battery Chargers
