29-04-2017  (1660 lectures) Categoria: Articles

Standard Alkaline Battery Charger

Charge your non-rechargeable Alkaline batteries (new method)

POSTED BY ILIAS-MAN ON聽WEDNESDAY, FEBRUARY 8, 2012 3 COMMENTS
We thought that limiting the current of recharging the batteries did the trick,聽but no! the electrolyteleaks from the end of the negative terminal, when the battery leaks, it loses in the best case 50% of its capacity. more leakage always ends with a small explosion,聽so another method is needed!!!

The technique of a discontinuous contact: thanks to this technique the battery could suffer much lessstress when recharging but on condition of leaving the battery two times longer to rest than to recharge (2 seconds of 6) 2s charging, 4s resting, And it works! batteries recharged without problems!
weather when recharging AA, AAA or 9 volt,聽no problem it works and it does not leak.聽In the worst casewe can always limit the intensity.
The circuit consists of a simple oscillator that charges the batteries for 2 seconds and stop for 4 seconds.
The oscillator drives the Mosfet that charges the batteries.
Choose any mosfet Type, and any small transistor, that handle the charging current, if you want to charge a lot of batteries choose a high current transistors.
Another transistor and a potentiometer control the charging current, to charge all types (AAA AA 9V):
I recommend:
  • AA: maximum 250mA
  • AAA: 110mA max.
  • 9V:聽70mA max.


To recharge the batteries you must inject a voltage greater than the batteries voltage聽by X1.5.
This charger can charge as many batteries as you want!聽with 12 volts can be up to 6 (with聽more than 12 volts but in this case consider increasing the value of some resistors).
To make sure that your batteries are full charged and not damaging them,聽monitor their voltage, it should not exceed聽110%, for example: a battery of 1.5V, maximum charge voltage is 1.65V.
(considering regeneration 80%), a 2Ah battery needs 20h for a complete recharge, Long? not really if you're not pressed.
Im谩genes integradas 2Im谩genes integradas 1
Notes:
Before charging the batteries try to select them: never聽take that are not alkaline,聽leaking already,聽whichare rusty,聽which are of a mark "cheap ",聽that give "0.00 volts"聽or supposed to be "outdated "for too long.聽Remember that alkaline batteries can be recycled. no saline lithium or any non alkaline battery it won't work and it's dangerous.
The source video from youtube (but in french!):
Thanks


http://www.americanradiohistory.com/Archive-Hobbyist-Specials/Electronics-Hobbyist-1975-Fall-Winter.pdf#page=43




versió per imprimir