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AA Battery Solar Charger 1: This almost trivial circuit may be used to charge a pair of AA or AAA sized cells in the sun. I have used it to keep my Palm Pilot and walkman radio running perpetually. This is an unregulated charger, proper charging is achieved by placing the unit in the sun for a known amount of Time, this Time varies according to the battery type.

Battery Charger Takes on Two Roles

Battery Chargers indicates Rate of Charge:
A single LED indicates whether the battery Chargers s delivering a trickle charge or a fast charge, circuit designed to charge2-14 cells

Buck Converter Chargers Also Provides System Power:
Switching Regulator provides the charge voltage set point with Current regulation, and second Switching Regulator provides5V System Power

Build a Smart Battery Charger Using a Single Transistor Circuit:
The following automatic battery-charger design is created with a circuit that could qualify as the simplest window comparator ever built around a single transistor (see the figure). It starts charging...  

Car Battery Charger:
quickly and easily charge most any lead acid battery, automatically turns charging off when ready

Car NiCd Charger:
This circuit provides up to20-Volt output from a regular13.2V automotive battery, to enable constant current charging of NiCd battery packs up to15 cells @1.2V (18V total).

Charge Li Ion Batteries From AC Line Voltage:
Converts energy from120 Volt AC to a regulated voltage or Current as necessary to charge two Li ion Cells in series

Charge Monitor for 12 Volt Rechargeable Lead Acid Battery

Constant Current NiCd Charger: The schematic for this charger is pretty simple. You can charge from1 to20 +/- NiCads at a constant current of from20 to200 ma +/-.

GellCell Battery Charger: circuit to charge a Gell Cell or other lead-acid type battery, includes sense circuit

High Efficiency 3Battery Chargers Use LM2576 Regulators:  National Semiconductor Application Notes,05 Aug1995

IC Controlled Emergency Light With Charger

Lead Acid Charger Signals End of Charge:
Lead acid Battery Charger that works with either gel or wet Cell, lead acid,12V Batteries

Make your Own Simple Rx / TX Battery Charger With Peak Detect: This circuit is designed to peak charge Rx and TX batteries. Its programmed for a C/2 charge rate for250mAh and500mAh batteries (charge currents of125mA or250mA). Itll charge Rx from12V at the field, TX from a15-Volt supply (like a car w/engine running). Use a15-18V supply to charge at home (you should be able to find wall cubes with this rating). It is based on a Maxim IC, the MAX713.

Motorcycle Battery Charger

Nicad battery charger

NiCd Battery Charger: uses a single transistor as a constant current source

NiCd Charge Rate Monitor

NiCd or NiMH Battery Charger: This charger can be used for AAA, AA and Baby C batteries. This battery charger is based on MAX712/MAX713.

NiMH / NiCd Switched Mode Fast Charger: 4/5 Phase fast charge algorithm, allowing fast but Battery friendly charging

Optimizing High Frequency Battery Charger Performance for Worldwide Applications: Providing Power for electric vehicles for worldwide use requires knowledge of energy conserving and high efficiency technologies

Power inverter is bidirectional:
If you want to swap charge in either direction between unevenly loaded positive and negative battery buses, you need an inverting dc transformer. One implementation is the symmetrical flyback converter shown in Figure 1. The circuit can generate a negative output from a positive supply or a positive output from a negative supply..

Remote Charging Circuit uses Three Wire Sensing:
Remote voltage sensing usually uses a four wire sensing System, this System works with three Wires

SCC2 1012 / 24 Volt Solar Charge Controller

Sealed Lead Acid Battery Charger Design Documentation: based on the UniTrode UC3906 Integrated Circuit

Shunt Battery Charger Provides 1Continuous Current: A shunt method is Preferable than series regulation in Solar Powered Systems

Simple Car Battery Charger

Simple Circuit Charges Lead Acid Batteries

Single Cell Lithium Battery Charger

Smart Battery Charger

Solar Cell NiCd Charger

Solar Charger for Lead Acid Batteries: Solar lead acid charger, with battery voltage monitor, for12V battery

Solar Panel Charge Controller / Low Voltage Disconnect Circuit: Lead acid charger, with battery voltage monitor, power comes from solar panels

Solar Power Recharge

Super Fast Battery Charger Design With NeuFuz: National Semiconductor Application Notes,05 Aug1995

Supply derives 5 and 3.3V from USB port:
The circuit in Figure 1 derives its power from a USB port and produces 5 and 3.3V supply rails for portable devices, such as digital cameras, MP3 players, and PDAs. The circuit allows the port to maintain communications while, for example, charging a lithium-ion battery. IC2 boosts the battery voltage, VBATT, to 5V, and IC3 buck-regulates that 5V output down to 3. .

Switching Current Pump Makes Better Charger

Temperature Controlled NiCd Charger

Trickle Charger: Explains what trickle charging is, contains some basic trickle charging circuits.

Typical Rechargeable Flashlight Schematics

VK3EM Sealed Lead Acid Battery Charger MK II: A high-tech lead acid charger, uses the uc3906 chip