Q:What are the characteristics of the series and parallel battery packs?

After the battery series, the voltage is added, the current is equal, thus increasing the voltage.

Q:I reconnected the charge pack correctly, and although it was nearly drained, it doesn't look like there was any damage done to the electrical system in the car.

You should not attempt it. It can cause damage to the car. It can also cause an explosion which can be deadly. If you have another battery pack try connecting that one for a safer result.

Q:I took apart a dead Roomba Battery pack to see if I could replace a few cells and found that one of the battery's polarity had switched from negative to positive. I've never seen this. Luckily it was at a very low charge. Do you know how to reverse polarity on a NiMH battery so I can reuse it? Or am I out of luck?

It's not wise to mess with NiMH batteries. Touching the wrong wire to the wrong spot has been known to explode/catch on fire. Normally the only way a battery can reverse polarity is if it was completely dead, and somehow was hooked up backwards. If it was just one battery out of a battery pack(like cordless phone batteries are nothing but rechargeable AA/AAA batteries hooked up). If you're skilled and everything is still hooked up, you can buy a rechargeable NiMH battery and hook it up the exact way it was with the others. (assuming it's the AA/AAA battery sequence and not a special shaped battery)

Q:I want to light up one strand of Christmas lights on my balcony but I can't run the extension cord we have through the sliding door. Is there such a thing as a battery pack for what I am trying to do? I'm open to any other suggestions as well.

You know, I was trying to find something to light up the ledge in my house and found a wireless outlet. It was at Walmart I think.

Q:I have an XBOX 360 battery pack, and it doe's not work. when ever I put the charger on the controller, the controller just does nothing, but the controller does work, but when I leave for a long time, it's still not charged. What can I do ?

you may need to bring it to gamestop or where ever you got it and they might try to fix it

Q:I am trying to build my own battery pack to fit my needs for me and my robot. And I was wondering if their are any good tutorials, books or websites out their on this topic. Thank you.

It depends on the required voltage and power needs. Different batteries have different voltages (difference of potential between the + and - terminals) and Amp-hour (total potential hours of operation at one Amp of current) ratings. If you need a power source that isn't currently available for sale, try stringing together many of the same type of battery (same voltage and Amp-hour rating), connected in series. If this is a store-bought robot, I have to assume it came with a battery pack, probably a series of rechargeable AAs in a heat-shrunk package. If you made the robot yourself, you need to know the required voltages for each of its subcomponents and may have to have multiple power supplies. Or just find the nearest Radio Shack.

Q:I have Rock Band drums that take 3 AA batteries and I don't want to waste batteries. Is there a way to make something that plugs into the wall and connects to the battery sockets (1.5 volt)?

I assume there's no external power connector on your drums (bad design in my opinion). There are some products in the market that do what you say, but they are specially made for specific devices such as professional flashes and cameras. The problem is that each battery compartment is different, and you also have a problem with the door. I think you're way better off by getting a good set of rechargeable batteries and a wall charger. Buy brand (Energizer, Sanyo, etc), you'll save money in the long run.

Q:i have just receved a venom racing 3000mah 7.2v 6cell battery pack. does any one know the charging rate?

This okorder

Q:Help i got a xbox 360 Christmas of 09 and i also got a nyko rechargeable battery charge kit.I can't get the battery pack out it's stuck i have tried everything but nothing work's!The pack still work's fine but the fact i can't get the battery out worry's me (PLEASE HELP!

Nyko Rechargeable Battery Pack Xbox 360

Q:a 9.6volt 1100mah battery does not hurt it at all. also current amperage affects rof and power too right?

If you put a 10.8v battery in there, you will wreck every internal gear that there is to wreck, that is way too strong for a stock gun, especially a clone brand. Stick with the 8.4v, or whatever battery came with it, otherwise your friend has just lost a large investment