This is definitely a good bargain for those who want a field power solution. I only ask for $100 HKD for all three items since I've no more use of them. I current mount wants 9V rather than 12V and I don't use a notebook in the field now.
First of all, it's a Panasonic 12V 7Ah Sealed Lead Acid (SLA) battery. SLA battery holds charges really well, and you should keep it charged at all time and it's ready for field use any time! There's no memory effect for this type of battery.
And next is the charger. This one will charge a 12V SLA battery and also a 6V SLA battery. Charging is pretty fast and safe.
Finally there's a transformer for notebook, it supports various type of plug and it support 15V, 16V, 18V, 19V, 20V, 22V and even 24V! So you may use it for any other devices as well.
$100 HKD takes them all, just leave me a message.