Picture of Reviving an old electric screwdriver
Digging in the drawer of things "to fix" I found this old screwdriver that  only was working with the power being plugged in, so these are the steps to change the batteries and "revive" this useful tool.

Revivir un destornillador viejo
Rebuscando en el cajón de “ya arreglaré” encontré este destornillador viejo que no me daba potencia y solo funcionaba estando enchufado, así que estos son los pasos para cambiar las baterías y “revivirlo”.

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Step 1: Open It!

Picture of Open It!
The first is to drop all the screws to get inside. Beware with the red one, which goes under a small cover.

Lo primero es soltar todos los tornillos para poder acceder al interior. Cuidado con el de color rojo, que va debajo de una pequeña  tapa.

Step 2: Taking off things

Picture of taking off things
Here is the guts of our screwdriver, as we can see, is not  "high tech", on the contrary, is a very simple circuit. We can see the switch (No. 1), the battery pack that will be replaced (No. 2) and the small charging circuit (No. 3). Care to cut the wires from the switch and the load circuit, if the cut as long as possible you will not to replace them later.

Aquí tenemos las tripas de nuestro destornillador, como podemos ver, no es que sea “alta tecnología”, al contrario, es un circuito muy sencillo. Tenemos el interruptor ( nº 1), el pack de baterías que vamos a sustituir (Nº 2) y el pequeño circuito de carga (Nº 3). Cuidado al cortar los cables del interruptor y del circuito de carga, si los cortamos lo más largos posible, no tendremos que sustituirlos más adelante.

sunvip991 year ago
Rather impressive article with some good points! I love this entry. Get information
quatch2 years ago
Changing the battery chemistry without changing the charging circuit can be dangerous. Although, NiCad and NiMh are fairly similar in charging characteristics.

To be on the safe side, don't charge for more than 14hrs (at 0.1C rate max) in case the trickle charge limiter doesnt apply anymore, and I'd keep a close eye on it to ensure it doesn't warm up (catch fire & explode..).
Paxpan (author)  quatch2 years ago
Thanks quatch, the charger I have say for NiCd and NiMh, anyway I never charge for more than 8 hours.