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Old 1st April 2016, 02:56   #151
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Default Re: How to Jump Start your car (dead battery)

Quote:
Originally Posted by S_U_N View Post
The other day, when testing the headlights in the workshop, my Zen's battery drained off.
So, the mechanic took another battery and just held it in his hand upside down and touched the positive to my dead battery's positive terminal (I am not sure if he also touched the negative).
And then he asked someone to crank the engine - and voila - it started.

How safe is this method?

Replying to a very old post but felt it is very necessary to reply to this one:

This is a very very unsafe method. It could result in injury and immediately spoil the booster battery.

1) If any of the six caps are not tightened properly, acid could fall out on the hands / engine / the battery you are trying to boost.

2) Even if the caps are tightened, the acid would come down and almost half of the battery plates (which are originally immersed in electrolyte during a normal upright position) would be exposed to air. Drawing a vehicle starting current (50-100 ampere) from such air-exposed plates will cause sulphate to build up immediately and damage the battery.

3) It is never recommended to use the booster and dead battery connected terminal for terminal. The risk of electrical problems in such a case is high. This is the reason we connect the negative of the booster to the chassis of the car being boosted.
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Old 1st April 2016, 09:35   #152
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Default Re: How to Jump Start your car (dead battery)

Quote:
Originally Posted by ankurbhageria View Post
Replying to a very old post but felt it is very necessary to reply to this one:

This is a very very unsafe method. It could result in injury and immediately spoil the booster battery.

1) If any of the six caps are not tightened properly, acid could fall out on the hands / engine / the battery you are trying to boost.

2) Even if the caps are tightened, the acid would come down and almost half of the battery plates (which are originally immersed in electrolyte during a normal upright position) would be exposed to air. Drawing a vehicle starting current (50-100 ampere) from such air-exposed plates will cause sulphate to build up immediately and damage the battery.

3) It is never recommended to use the booster and dead battery connected terminal for terminal. The risk of electrical problems in such a case is high. This is the reason we connect the negative of the booster to the chassis of the car being boosted.
Thanks. Some doubts
1. During boosting, both booster car & battery-dead car should have engine on with idling?
2. When the dead battery is able to be cranked, should we shut off engine of booster car?
3. In general what is the sequence of engine start & stop (both for dead-battery & booster car) during boosting and during disconnecting jumper cables.
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Old 6th October 2016, 15:10   #153
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Default Re: How to Jump Start your car (dead battery)

How to jump start a car with just a rope:



http://thegarage.jalopnik.com/how-to...ope-1787456976
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Old 7th October 2016, 21:27   #154
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Default Re: How to Jump Start your car (dead battery)

^^^
You'll most probably topple the car from the jack.

Regards
Sutripta
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