NiCd Charger with Thermal Peak Detection -  The electric model aircraft and car industries have produced a bewildering array of field chargers for NiCd motor battery packs. These range from simple 6 or 7 cell chargers consisting of a resistor and mechanical timer, to more complex chargers with peak detection, cycling, and the ability to handle 36 cell packs. The resistor/timer type of charger is cheap, but it is has two drawbacks.... [Designed by Stefan Vorkoettert]

NiCd or NiMH Battery Charger -  Rayovac NiMH Charger and Rechargeable Batteries.... The charger has already recharged my Rayovac 1600maH NIMH batteries countless times and has never left … (added 08/05)

NiMH Battery Charger Reference Design -  This manual describes a reference design for a NiMH battery charger that uses the Motorola MC68H(R)C908JK3E MCU. The MC68H(R)C908JK3E includes a 10-channel Analog-to-Digital Converter (ADC) and a 2-channel Timer Module which can be programmed....(app note added 3/05)

Optimizing High-Frequency Battery Charger Performance for Worldwide Applications -  07/06/00 EDN-Design Ideas  Providing Power for electric vehicles for worldwide use requires knowledge of energy conserving and high efficiency technologies....[Design Idea added 5/02] EDN migrating links. This link is not verified.  Google the "title" EDN for new link.

PIC NiCad Battery Charger -  Circuit designed by Peter Hayles.  This cheap and easy to build NiCd/NiMH Battery Charger is suitable for automatically charging a wide range of batteries for many applications. Proper chargers are usually expensive and cheap chargers supplied with the original equipment often incorrectly charge the cells and dramatically shorten their life....(added 10/05)

Picref-2: Intelligent Battery Charger -  Microchip Application Note Published 29-Jul-98  (app note added 2/06)

Portable Ni-Cd Battery Charger: Inexpensive Load Tolerant Step-Up Energy Source -  Zetec Semiconductors  Applications Notes A relatively simple low parts count topology is presented for a one transistor design, that allows "in the field" re-charge of Ni-Cd battery packs from a convenient energy source such as an automotive battery. The note includes transformer design and winding details. Though designed for a specific case, the circuit and the principle employed should lend itself to many other applications.   (app note added 2/06)

Sanyo's USB Powered NiMH Charger -  Late in 2006, I found out about Sanyo's new Eneloop Nickel Metal Hydride (NiMH) rechargeable batteries, available in AA and AAA cell sizes. Unlike regular NiMH offerings from other vendors (e.g. Duracell, Energizer, Gold Peak), Sanyo claimed the following benefits for their Eneloops:... [Stefan Vorketter's web site]

Smart Battery Charger with Smbus Interface -  Microchip Application Note Published 26-Aug-97  (app note added 2/06)

Smart Battery Charging with COP8ACC -  National Semiconductor Application Note  (app note added 2/06)

Solar Cell NiCad Charger -  Schematic & notes only, there is not a circuit description…. [Tony van Roon's circuit]

Switcher IC hikes Battery Charger's Efficiency -  06/23/94 EDN-Design Ideas  The adjustable switching-regulator LM2575T-ADJ, IC1, in Fig 1 replaces a power-wasting pnp transistor in the data-book design for the NiCd battery charger IC2, a MAX713. (Its sister device, the MAX712, handles NiMH cells.]IC2 "fast-charges" cells by monitoring the cell's voltage and charging current....[Design Idea added 6/06] EDN migrating links. This link is not verified.  Google the "title" EDN for new link.

Switching Current Pump Makes Better Charger -  01/16/97 EDN-Design Ideas  Many currently proposed battery-charger designs are simply voltage regulators redesigned to be current sources. Unfortunately, this design approach is far from optimal because it leads to unnecessary hardware redundancy and complexity.  This type of charger also raises a stability problem because of the additional active device in the feedback loop....[Design Idea added 08/05] EDN migrating links. This link is not verified.  Google the "title" EDN for new link.

Switching regulator charges NiMH batteries -  12/21/00 EDN-Design Ideas  / PDF contains multiple circuits scroll to find this circuit....[Design Idea added 6/06] EDN migrating links. This link is not verified.  Search the "title" + "EDN" for new link.

Temperature Controlled NICD Charger -  This circuit is for a temperature controlled constant current battery charger. It works with NICD, NIMH, and other rechargeable cells. The circuit works on the principle that most rechargeable batteries show an increase in temperature when the cells becomes fully charged. Overcharging is one of the main causes of short cell life, hot cells pop their internal seals and vent out electrolyte. As cells dry out, they lose capacity. [G. Forrest Cook]

Universal Nicad/NiMH Battery Charger -  Sometimes its more convenient to recharge batteries 'in place' rather than removing them and putting them in an external charger.  This device is built around a PIC12F675 (a dandy little part from Microchip). The number of cells ( 1 to 8 ) is programmed in using the one button. The cell count….(electronic schematic added 06/09)

Universal Nicad/NiMH Charger -  This device is built around a PIC12F675 (a dandy little part from Microchip).   The number of cells (1 to 8) is programmed in using the one button.  The cell count is saved in EEPROM the next time you power up the device… [Luhan Monat - Mesa Arizona]