I have a battery pack that takes 4AA batteries but the black and red wires got broke off of it. Can I take a 9 volt battery and touch the black and red wires into the 9V and make it work?
Gas stations (what are left of them) always charge high non-competitive prices. The installation is never charged for, unless cables or other parts are needed. The cheapest place for a battery is Wal-Mart, where they go from $60-to probably $150 in extreme cases. But of course you did not take it to Wal-Mart so I am not surprised. I wouldn't necessarily condemn the mechanic on that basis alone--his prices might be fair or good in other areas. I take it you weren't actually broken down so you wanted to know how much he charges for batteries and now you know. Has this guy ever done any work that you were satisfied with? If no, then why bother?
A nine volt battery may not have the current necessary to run a device that the AA batteries have. You need 6 volts not 9.
Get a new holder and battery clip from Maplin.
Each AA battery is 1.5 volts. 4 AA batterys 6 volts. If you hook up a 9 V battery, you might overheat (aka blow up) whatever you are hooking up. It is too much power. The ends are just metal connectors so whether they are the same or not, are just used to conduct the electricity.
No. 4 AAs at 1.5 volts each can only supply (depending on how they are hooked up in the pack) 6, 3, or 1.5 volts. Most likely, they are connected to supply 6 volts. All are less than 9 volts.
