Do you have a pile of AA rechargeable batteries in your drawer? Some are old, some are new, but which sets would you bring with your camera on your next trip, and which ones are past their useful life? I like using rechargeable batteries, but I’m certain that some of them are not living up to the stated capacity on the label.
Rechargeable Battery Capacity Tester – [Link]
When I got into electrical circuits and solar power the first thing I wanted to do was build a little solar powered battery charger. Only I had a heck of a time trying to find a simple and strait forward guide to doing this.
$4 Solar Battery Charger – [Link]
This project builds a simple automatic battery discharge analyzer. It can be used to measure the discharge characteristics of the batteries. The output data can be expressed into a graph with a spreadsheet by sending data to PC via RS232.
Battery Discharge Analyzer – [Link]
Laptop batteries can be repaired but such work only makes economical sense for smaller operators.
The success rate varies with battery type.
One must remember that the ʽsmartʼ battery consists of two parts, the chemical cells and the digital circuit.
In some cases, the chemical part can be fully restored but the fuel gauge may become inaccurate or other data may get corrupted.
Repairing Laptop Battery – [Link]
Okay, so I’ve looked around for an idea for an instructable. And I found one that I want to do my own rendition of, the penny battery. So this idea is not completely original, I’m not claiming it as mine. I’m just using the materials and methods that I think will be the most effective. My hope is to power and LED light or a small fan if possible. But if I make the led die, then I have sufficiently surpassed my expectations. Let’s get started.
Battery from Pennies – [Link]
The bq28400 provides battery capacity and safety monitoring optimized specifically for 2-cell Li-Ion and Li-Pol applications. This single-chip fuel gauge and analog front end (AFE) provide a first level of protection against all cell fault conditions: over/undervoltage, overcurrent, temperature, and imbalance between cells.
2-Cell Lithium-Ion Fuel Gauge and Protector – [Link]
Of all the criticisms of electric vehicles, probably the most commonly-heard is that their batteries take too long to recharge — after all, limited range wouldn’t be such a big deal if the cars could be juiced up while out and about, in just a few minutes. Well, while no one is promising anything, new batteries developed at the University of Illinois, Urbana-Champaign do indeed look like they might be a step very much in the right direction. They are said to offer all the advantages of capacitors and batteries, in one unit. [via]
Complete battery recharging within minutes – [Link]
Microchip’s MCP79411 general purpose I2C™Compatible real-time clock/calendar (RTCC) is highly integrated with nonvolatile memory and advanced features including a battery switchover circuit for backup power, a timestamp to log power failures and digital trimming for accuracy. It can use a low-cost 32.768 kHz crystal or other clock source and the chip operates over a supply range of 1.8 to 5.5 volts. [via]
MCP7941X I2C RTCC with EEPROM, SRAM, Unique ID and Battery Switchover – [Link]
An introduction to USB battery charging: a survival guide. [via]
Arguably the most useful part of USB’s power capabilities is the ability to charge batteries in portable devices, but there is more to battery charging than picking a power source, USB or otherwise. This is particularly true for Li+ batteries, where improper charging can not only shorten battery life, but also can be a safety hazard. A well-designed charger optimizes safety and the user experience. It also lowers cost by reducing customer returns and warranty repairs. Charging batteries from USB requires balancing battery “care and feeding” with the power limitations of USB as well as the size and cost barriers ever present in portable consumer device designs. This article discusses how to achieve this balance.
The basics of USB battery charging: a survival guide – [Link]