Because the weed eater gets its power from the battery, not the charging unit. The charging unit most likely does not have enough amps to run the unit, whereas the battery does after a full charge.
no, using your headlights during the day, just uses power from the battery, and not from the engine, the battery is constantly being recharged , while the engine is running, any way,
A cell in a rechargeable battery does that when it's being recharged.
Battery cycling is a process in which a battery's charge is entirely or nearly depleted, recharged, and the process is repeated. In your case, the battery is not designed to do this for safety reasons, presumably battery explosion. As long as the battery is constantly being recharged by the alternator of your boat's engine and not cycled, you have nothing to worry about, aside from standard precautions and preventive maintenance.
It depends on the type of battery you have in your laptop.NiCd (Nickel Cadmium) batteries have a sort of memory effect. It is a good idea to cycle (Discharge fully) these kind of batteries as this ensures maximum capacity for longer.NiMhd (Nickel Metal Hydride) does not have this memory effect. They should not need to be discharged fully before being recharged.Memory effect is:The battery "remembers" after a few times of being recharged, when it was recharged. The capacity will then start to drop drastically and begs for a recharge when it reaches the point of where it normally have been recharged before.Example:A battery (NiCd) being at 50% and then recharged will after a few times drop the voltage at 50%. This giving the impression that it is "empty" where it is not really so.Note:The memory effect can be cancelled with a couple of deep discharge and full charge again. The battery is then -revived- brought back to capacity again.
If your engine is running , and the battery light comes on , that indicates that your battery is not being charged
check your battery post terminals for good clean connection. If no problem there then you might have a bad generator. Your generator might not be charging your battery. If you installed a new battery and ran your bug all day chances are that your engine was running off of the battery which was not being recharged by your generator. As soon as you turned off your engine and tried to re-start it, your battery did not have enough juice to crank the engine over. Good luck.
When I plug in my laptop, it does not use the battery to run the computer. Instead, it uses the wall outlet to run the computer and to recharge the battery. So, by leaving my battery in my laptop when it is plugged in, I am recharging my battery and not running it down. If you take the battery out of your laptop and do not recharge it, it will not last long. The computer batteries that I know about can go from 2 to 8 hours without being recharged.
Often cars that are parked overnight need to be recharged. It is possible that the battery has died and needs a replacement or a jump to start.
Disconnect the negative cable.
GAWD H8S U LOL If you mean a lead acid battery from a car then yes it is, especially when being recharged. Batteries for torches and remote controls etc, also called dry cells, are safe.
That light doesn't mean that your battery needs to be replaced. It means that your battery is not being charged while the car is running. Have your alternator tested.
No, completely discharging a lithium battery will damage it significantly reducing its ability to hold charge. However a lithium battery that is discharged to just a few percent of completely discharged before being recharged will get more successful recharge cycles than one that is recharged much earlier. Its a somewhat tricky balancing act and I have destroyed a few batteries myself by not stopping the discharge soon enough.