Posts Tagged ‘battery’

PortL2 – Portable electric vehicle charger

Tuesday, June 11th, 2019

Here’s a project log covering the build of a portable level 2 electric vehicle charger by Andrew Rossignol: This is a battery-powered EV charger that allows destination charging where L2 charging is not ordinarily available. This can be used as a range extender for electric vehicles with smaller batteries. This...

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Posted in DIY | No Comments »

Battery switch

Friday, December 7th, 2018

An open source battery switch project from Open Electronics: Given two batteries, it chooses the one to connect to the load based on the voltage measured at their poles. It can also be used to switch DC power supplies. More details at

Posted in open source | 1 Comment »

Tool battery teardowns: Craftsman 19.2V and Ridgid 12V

Monday, September 10th, 2018

Russell Graves did teardown of a Craftsman 19.2V DieHard battery and a Ridgid 12V battery: It's time for more tool battery teardowns!  This week, I've got a Craftsman 19.2V DieHard battery, and a cute little Ridgid 12V battery.  They're both lithium, and I'm going to dig into both of them, because...

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Low cost single cell battery pack simulator

Thursday, March 1st, 2018

Mare writes: There are many battery cell simulators available which could simulate battery cell(s). Unfortunately, none is emulating any of the digital protocols used by fuel gauge devices. Optimal solution to efficiently emulate given smart battery pack is to use custom solution based on battery cell simulator and fuel gauge...

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Posted in DIY, how-to | No Comments »

5V Regulator Cap for 9V battery

Saturday, March 18th, 2017

David Cook built a 5V regulator to sit atop a 9V battery: For quick portable projects and temporary hacks, it is often faster to reuse a simple 5V regulator circuit than to integrate a power supply into the device design. My toolbox has an LED tester and magnifier light, so...

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An A/B battery replacement for the Zenith TransOceanic H-500 radio with filament regulation

Thursday, January 26th, 2017

KA7OEI built a battery pack to replace the obsolete "A/B" battery for Zenith TransOceanic (ZTO) H-500 and wrote a post on his blog detailing its assembly: There are several things that I decided that this voltage converter should do: Automatically power up and shut down when the radio is turned...

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App note: Using Cymbet™ EnerChip™ batteries instead of coin cells and super capacitors

Sunday, September 4th, 2016

High charge/discharge cycle and solid state reliability EnerChip from Cymbet make this a good replacement for super caps and coin cell backup batteries. Link here (PDF) Primary and secondary (i.e., rechargeable) coin cell batteries, as well as super capacitors, have been in use for years as auxiliary power sources for...

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Posted in app notes | 6 Comments »

A low-voltage disconnect for 12 volt lead acid and lithium batteries

Thursday, August 11th, 2016

KA7OEI writes: The avoidance of overcharging is usually pretty easy to avoid: Just use the appropriate charging system - but overdischarge is a bit more difficult, particularly if the battery packs in question don't have a "protection board" with them. Lead acid batteries (almost) never come with any sort of...

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Posted in DIY, hacks | 2 Comments »

The AAduino

Thursday, May 12th, 2016

Johan Kanflo has a new project posted the AAduino, that is available on Github: The AAduino is an wireless Arduino clone the size of an AA battery with Keystone battery terminals rotated 180° to act as positive and negative terminals. It is powered by an ATMega328p and is fitted with...

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Posted in Arduino, wireless | No Comments »

Automatic 18650 Analyzer

Thursday, November 5th, 2015

Gregor wrote an instructable detailing the build of his Automatic 18650 Analyzer project: The idea behind this project was to create a cost effective device that could automatically charge and discharge multiple 18650 cells while determining the effective capacity of each individual cell. Individual cells can be binned by capacity,...

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Posted in DIY | 3 Comments »

App note: Fast charging control with NTC temperature sensing

Sunday, October 18th, 2015

Vishay's application note on fast charging control using NTC and TI's BQ2005. Link here (PDF) The need for increased autonomy for new models of laptops and cellular phones has resulted in high-energy density power packs - Ni MH and Li-ion batteries. These batteries can be charged quickly, on the condition...

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App note: Building a battery operated auto ranging DVM with the ICL7106

Saturday, February 14th, 2015

Intersil's application note (PDF!) on building a battery operated auto ranging DVM with the ICL7106: This application note describes a technique for auto-ranging a battery operated DVM suitable for panel meter applications. Also, circuit ideas will be presented for conductance and resistance measurement, 9V battery and 5V supply operations, and current measurement.

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Posted in app notes | 9 Comments »

Teardown of Kentli PH5 1.5 V Li-Ion AA battery

Tuesday, December 23rd, 2014

Jason over at Rip It Apart did a teardown of a Kentli PH5 1.5 V Li-Ion AA battery: The PCB that holds the 1.5 volt regulator is inside the end cap, with the rest made up of the Li-ion cell itself. Curiously enough, the cell inside is labeled “PE13430 14F16 2.66wh”...

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Posted in Teardowns | No Comments »

Battery fuel gauge with zero parts and zero pins on AVR

Friday, November 7th, 2014

Josh Levine writes: It can be nice to know how much battery power you have. It becomes critically important with LiPo batteries since you can permanently damage them by running the voltage down too low. Typically battery voltage detection requires adding a circuit with extra parts and their associated power...

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Posted in AVR | 5 Comments »

BT-C3100 intelligent battery charger teardown

Thursday, August 28th, 2014

Alan Parekh of Hacked Gadgets writes: Thanks to GearBest for sending in this Opus BT-C3100 V2.0 Intelligent Battery Charger for review. at a quick glance this charger might look like any other charger that you see at the grocery store.  Your generic store bought brand probably also has 4 charging bays for AA and AAA...

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Posted in Teardowns | 22 Comments »

A 5c lithium ion battery charger

Monday, August 25th, 2014

Nerd Ralph writes: As various sites explain, lithium-ion rechargeable batteries should be charged to 4.2 volts. USB ports provide 5V, so all I needed was a way to drop 5V down to 4.2 or less. Standard diodes have a voltage drop of 0.6 to 1.0 volts, so I pulled up...

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Posted in how-to | 40 Comments »

Cheap battery-powered micro-controller projects

Wednesday, June 25th, 2014

An article on cheap battery-powered micro-controller projects by Nerd Ralph: Once the higher cost of a 9V battery is factored in (about $1.50), the 9V battery is clearly more expensive than a 3V coin cell. However you may have a cheap source of 9V batteries - smoke detectors. I've found...

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Posted in power supply | No Comments »

App note: Getting the most out of the MAX14920/MAX14921 high-accuracy battery-measurement AFEs

Saturday, April 26th, 2014

An  application note from Maxim on getting the most out of the MAX14920/MAX14921 high-accuracy battery-measurement AFEs: The MAX14920/MAX14921 is a high-accuracy battery-measurement analog front-end (AFE) ideal for cell balancing and battery-measurement applications. The performance of the system in which the MAX14920/MAX14921 is used, however, depends highly on the components that support and surround...

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Tear down of a cheap external USB battery

Thursday, April 3rd, 2014

cpldcpu did a teardown of an external USB battery: The device has a USB micro-b socket which is used as 5V input for charging, and a normal USB-A socket as 5V output. The output power can be turned off and on by a toggle button. There are LEDs to indicate active power...

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Posted in Teardowns | 1 Comment »

App note: Lithium-Ion battery recycling made easy

Saturday, October 12th, 2013

An app note from Maxim: Lithium-Ion battery recycling made easy This application note describes how to recycle lithium-ion (Li+) batteries from older devices for use in other electronic devices, such as toys. This can all be done without the need for a microcontroller (or the required software). One challenge is that...

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Posted in app notes | 1 Comment »

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