I've ever had this experience with my Casio batteries on my Casio charger before. Everything seems to go on nicely, from the charging indicator, to the trickle charge indicator after the usual 3 hours of charging.
In the end, had this battery is empty message no matter how I place them into my DC on the very same day of charging.
Still don't know what went wrong. When I recharged them again, it took another 3 hours... :cry: