to charge, as in to charge a battery or a camera
I don't know how to say that I need to charge the card in my digital camera.
Charge the card? Do you mean charge the battery?
In Mexico we call small batteries like those in a camera "pilas".
Tengo que cargar las pilas de mi camara.
Necesito cargar la tarjeta de memoria en .. = I need to charge the memory card in my ...
Tengo que cargar... = I have to charge...
I will let you work out the rest ..
A Cuban friend uses the term "baterías recordables" for rechargable batteries.
I need to charge the memory card in my ...
This is weird in any language. A memory card in a camera is a passive device (does not store energy). You may need to empty/erase your memory card (if you've taken a bunch of pictures). Batteries (the rechargeable variety), on the other hand, may need to be "charged" (hace falta cargarlas)..