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FAQ

Hello: I have a mini phantom emergency-responder blue light that plugs into a car's cigarette lighter. Given how bright this light it, I would like to use it on the rear of my bicycle to make myself more visible when riding at night. To do this, I will need to hook it up to a rechargeable battery pack. Any idea how to do this??

Buy a 12V outlet that comes with a cord. Connect it to the battery pack and plug the light into it.

I have a 7.2v battery, and after I charge it , I use my battery volt tester, and it says the battery has 8.3v, and after the battery pack is almost dead, it says it has 7.3v. What does this mean? There's nothing wrong with my battery volt tester.

complex stuff. seek onto the search engines. it could actually help!

I was told today by a friend that the battery in my Dell laptop has a predetermined number of times it can be charged and if I exceed that number of charges the battery dies. Therefore, I was advised to remove the battery any time I'm using the A/C power. Is this true? Thanks!

get rid of vista if you plan on playing games, this would be a wrong choice with the intel graphics card. try to look for a model with a nvidia video card. your best bet is for the xps series. also, go with the larter 9 cell battery if you want a decent battery life. with the 6, you'll get about 1.5 hours battery time after about 2 months. with the 9, you will get about 3 hours or more.

DUE TONIGHT PLEASE HELPA 90 kg astronaut floating out in space is carrying a 1.0 kg TV camera and a 10 kg battery pack. He's drifting toward his ship but, in order to get back faster, he hurls the camera out into space (away from the space ship) at 18 m/s and then throws the battery at 11 m/s in the same direction. What's the resulting increase in his speed after each throw?speed increase after discarding camera.?speed increase after discarding battery?

The key here is to remember that momentum is conserved. Momentum is mass times velocity. Are you sure you've got the masses right, surely the TV camera is heavier than the battery pack? Since (relative to each other), neither astronaut, nor camera nor battery is moving, the total momentum can be taken to be zero. So after throwing the camera away, the total momentum should be zero m/s. That means the astronaut should have equal momentum in magnitude, but opposite in direction, to the camera. Let's take the direction the camera was thrown in to be negative. Then the momentum of the camera after it is released is (1.0 kg)(-18 m/s) -18 kg m/s. So the momentum after discarding the camera must be 18 kg m/s. Dividing by the mass of the astronaut (plus battery pack, as he's still got it at this point), which is 100 kg, gives an increase in speed of 0.18 m/s. Now we do the same thing with the battery pack. Since, relative to each other, neither are moving, we can say that the total momentum before releasing it is zero, so the total momentum after releasing it must be zero also. The momentum of the battery pack, since it is thrown in the negative direction also, is (10 kg)(-11 m/s) -110 kg m/s. Therefore the total momentum of the astronaut must increase by 110 kg m/s also, and dividing by the mass of the astronaut (90 kg) gives a speed increase of 1.22 m/s.

I was thinking of getting a mercury mariner hybrid, since I needed the cargo space, and wanted an SUV that got good gas mileage. I know that SUV hybrid packs are expensive, but some say the batteries can even outlast the car. Just to be safe, I wanna know where I can find one online, in case I ever need one in the future, so I can see firsthand how much they cost. I think the estimates I've read online are totally exaggerated. I've heard people paying $1200 to $6000 to replace battery packs. That's why I wanna see firsthand how much they actually cost. So, where do I find one?

Those prices are ball park and most likely include installation. Since different vehicles have different batteries, different configurations, etc, there will be a wide variability. Most dealerships will be the place to replace the batteries and it is beyond most home mechanics to do it safely. Ford/Mercury have numerous hidden warranties they do not talk about, and most manufacturers do this. They are likely to be silent about these ahead of a purchase, but they should be upfront about the battery packs, and what the corporate policy is regarding them. Some have reluctantly agreed to a replacement pack, even extending it to the next purchaser. They will not outlast the vehicle. 3 maybe 4 years tops, with a conventional loan these days, the person who makes payment 1 will in most cases not be the person making payment 60 or 72. So most initial purchasers will not see the battery replacement. They will pay a deductable, which covers the labor of the replacement, or a good portion of it.

i have had a rechargable battery pack for my xbox 360 wireless controller for a few months and its the kind where u take the back of and but it on a charger and when its charging it turns red, and when its dsone it truns green, lately it become dead and i put it on and it does green insteadof red, it did tht for a few months but still charged it, now it barely charges it. what is wrong and wat do i do?

You should buy new rechargeable battery cause they dont last for ever. They have a limited number of charging times depending on theyr quality.

I am creating a lighting system for a replica of The Ghostbusters Proton Pack. I have two different battery operated holiday light sets to reproduce the effect the movie props had. Both use 3 AA batteries can I wire a single battery pack and a toggle switch into both? I assume I would then need 6 AA batteries? Thanks in Advance!

Batteries in series add their voltage. Batteries in parallel add their current capability. By hooking both lighting systems to one battery pack you are going to drain the batteries faster. The concept of 6 AA batteries I would use 3 D size batteries if I was working with lighting so the battery would last longer and if I used rechargeable batteries, I wouldn't have to recharge them as often. Just some friendly advice - Garth

I have a sprinkler timer in the garage that is both connected to ac and a 9v battery. The 9 volt battery fails a lot. It actually powers the memory of each sprinkler station and run times. When the 9v battery is too weak to power the memory , the entire sprinkler system shuts down and reboots but will not run. How do I rewire the memory unit so that it runs on ac instead. I have an old 9v power pack that puts out 9 volts and 450 mA. Can I safely just connect it to the 9v connectors on my sprinkler timer?

Possibly not safe, as it may produce as much as 12 volts when the memory unit uses only one or two milliamps. How about connecting an extra 9 volt battery in parallel, and change the 2 month old battery about once per month.