Car Batterties

[peterliang]

I have a 1990 something BMW 740i sedan currently with no battery charge so it won;t start and I just borrowed a battery charger from a friend and don't know how to use it...anyone know a safe, manual way to charge up a car battery?

[rallydriver]

I think it would be more vice to buy a new battery because maybe your old one is dead. It wont hold the charge in it.

Why didn´t you ask instructions from your friend? He should know how to use it if he has it

[.59 Reverse]

charging a battery is pretty simply and straightforward with a charger.. just plug it in and follow the instructions that came with it..

if that doesnt work, there's always jump-starting the car with someone else's battery, then you can drive it around, and your alternator will recharge your battery.. but if you and everyone you know happen to be really clueless about car stuff, you're better off just taking it somewhere and telling them to change the battery for you..

[Zachary]

Originally Posted by .59 Reverse

if that doesnt work, there's always jump-starting the car with someone else's battery

sure that works with older cars, but jumpstart should not be used with cars that haves ECU or some other "hi-tech" electronical components.

even when jumpstart cables are connected right it might cause serious damage to electronical components (as example fried ECU).

[showNOmercy]

Red is positive (+) and black is negative (-). A typical slow charge would probably be 2 amps and a rapid charge would be 10 amps. Some chargers have a beefier setting for fast charging for a rapid start. My best advice is to go with the slow charge and double check everything before you plug in the charger, make sure you have the cables connected to the correct terminal on the battery.

Another very important thing to know when working around batteries is to never smoke or have an open flame as this can cause your battery to explode. Battery acid in the eyes can cause blindness, easily avoidable if your careful.

[Zachary]

Originally Posted by showNOmercy

Battery acid in the eyes can cause blindness, easily avoidable if your careful.

can or will

as ive seen that battery acid does even quickly burn large holes cloth if you spill it on them.

[maul]

Originally Posted by Zachary

as ive seen that battery acid does even quickly burn large holes cloth if you spill it on them.

Imagine how it feels on the skin :?
Sadly enough i have expirienced that

[nightcrawler]

It's no problem to jumpstart a car, old or new. I used to work as a car mechanic and as long as you do it right you are safe.

Never connect the cable straight from battery to battery, the plus cable (red) you can connect from Battery plus to Battery plus, the minus (black) you should connect to ground on the car that gets the jump. I have a friend that lost a eye when he connected wrong, the battery exploded.

Battery charger. Connect the red cable to Plus and the black to minus, if the cables arn't color coded the clamps should be marked + and -.

[ccsraj]

Originally Posted by peterliang

I have a 1990 something BMW 740i sedan currently with no battery charge so it won;t start and I just borrowed a battery charger from a friend and don't know how to use it...anyone know a safe, manual way to charge up a car battery?

Safe way to charge up the battery is to follow instruction given in the manual.If manual is not there you can better enquire your friend or get help from auto electrician.

[3n1g]

or if you're rich you can alwyas go to a bmw stand and say this batery's dead give me another car