Yes you can. The battery supplies only as much current (amps) as the lamp draws
when connected to 6 volts. The "12 amp" battery won't supply any more current
when the lamp is shining than the "6 amp" battery did, but it'll last twice as long
between charges.
Unless it is a rechargeable battery you cannot charge a dry charge battery. If it is rechargeable you need to purchase a charger for that size battery. Automobile batteries are not dry charge.
You can recharge a AA battery if it is a rechargeable battery like the 12 volt battery in your vehicle. You can buy a rechargeable AA battery or one that is not rechargeable they just cost more money.
Not if it's a regular duracell non rechargeable battery
It charge faster
with the cable it came with
If it is rechargeable use a 9.6 volt charger.
Fully charge the battery before its first use. The first 3 or 5 cycles try to fully drain and fully charge the battery.
Depends entirely on how much current you use to charge it.
It depends on what battery you have installed. If you have the rechargeable battery, it should have come with a charger. If not, bring the battery to a radioshack, or a similar place and they will get you a cord. If you don't have the rechargeable battery, then you need 6 double a batteries and you put them in under the cover on the back.
No they lose some of its power over time. it depends on the type of the battery. rechargeable lose more of there charge that normal battery's.
They are supposed to be rechargeable, so if you can find the right cord just plug it in. If the battery is faulty for some reason and won't charge, get in charge with the company and they will change the battery for you
Depends on whether the battery is rechargeable or not, and the battery chemistry, there are several different in the D-cell size.