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”.

Step 1: 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.
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Changing the battery chemistry without changing the charging circuit can be dangerous. Although, NiCad and NiMh are fairly similar in charging characteristics. <br> <br>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 &amp; explode..).
Thanks quatch, the charger I have say for NiCd and NiMh, anyway I never charge for more than 8 hours.

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