Battery capacity tester arduino

It is very difficult to identify the good cells in battery. If anyone saw my last instructable Simple Li-Ion Battery Power Tester they can now upgrade to a computerized hi-tech version that is capable. This tester can be used for NiC NiMh, and all flavors of Li-Ion rechargeables. This is a very simple capacity tester.

It consists of single resistor that discharges battery. Arduino measures the voltage drop across resistor.

See the new, improved and simplified version of the New Battery Capacity Tester ! So, I built this capacity tester for a few reasons: To satisfy myself that a battery would do the . A full lab testing of batteries can be obtained by connecting the discharge circuit to Arduino. As the design evolve I let two additional features creep in: Add a temperature sensor to track ambient temperature during the test since that certainly affects battery capacity. Tutorial how to make an accumulator battery true capacity and internal resistance tester.

Earlier in one of my Power Bank Instructable I have tol how to identify good cells by measuring their voltages, but this method is not at all reliable. Since most applications require batteries , invariably one problem battery makes the rest of them look bad. The Atmel ATMega3microcontroller has .

I thought that the description was too long so I (stupidly) cut out the “Automatic” and “ Capacity ” and now it is too late to change that! It is not the current state of charge of the battery that is tested but the current capacity of the battery – and it . The normal procedure for measuring battery capacity is to discharge at a constant current until the battery voltage drops to some endpoint voltage. The constant current and endpoint voltage should be specified in the battery datasheet.

It is normal for the battery voltage to recover when you remove the load. Your favorite device is running low on juice and needs a couple new AA batteries —and with a quickness. You run to the store and grab the first pack of AAs you see.

Denis Hennessy had this . Charge first, then measure the capacity. Moving on from a few interesting battery threads recently, how about using an arduino to test how much capacity your batteries actually have? I have one in a locker :) ) Briefly, arduino make relatively cheap processing boards used much by diyers with easy ways to connect multiple devices with the . This time, it is more complicated and I will be using EVERY standard IO pin on the arduino Micro. The purpose of this device is to discharge up to FOUR lithium batteries and count the Ah that was drained from them and display it on . The battery discharge tester is quite simple.

All it does is discharge a battery across a load resistor that has been sized to discharge a battery at its rated capacity over the course of five hours.