Q:

charging a 12V calcium battery

I have recently purchased a Halfords 12V calcium battery second hand off facebook. I was told it was about 6 month old ( it does look new ).
The problem is it will not charge using my trickle charger' that works fine for all my other batteries.
Do these new calcium type need some special charger?

A:

The problem is it will not charge using my trickle charger

The typical lead acid charging voltage is between 2.15 volts per cell (12.9 volts for a 6 cell battery) and 2.35 volts per cell (14.1 volts for a 6 cell battery).
The ideal charging voltage for a calcium battery is 14.8V for the recombination process to properly occur.
The above indicates that your trickle charge will not deliver enough charge to completely recharge you battery.
If it does charge, it might be worth considering whether your alternator is suitable for a calcium batttery, (I think most bring the voltage to around 13.6V).
Be very careful around the battery, the voltage is small but the current can be massive, you do not want a silver necklace to fall between the terminals!!

