[tkw138]

Something to share and may be good to know...

When I sent my car to a workshop for battery replacement recently.
I noticed the mechanic purposely start and leave the car engine running and replaced the battery.
I thought he was smart.

And now I know I'm stubit...because I didn't know it can impact my pocket badly.

So, before witnessing a battery hot swap, here may be some information for reference.

Extracted a paragraph from one of the articles posted online for general references.

One of the advices suggesting never disconnect the battery with the engine running.

"Never disconnect the battery with the engine running. Doing a battery "hot swap" for example, in theory the surge protection diode will stop any damage from occurring, however it is very far from unknown for this diode to fail, if it does you will then need to replace the alternator..."

[neonlee]

Something to share and may be good to know...

When I sent my car to a workshop for battery replacement recently.
I noticed the mechanic purposely start and leave the car engine running and replaced the battery.
I thought he was smart.

And now I know I'm stubit...because I didn't know it can impact my pocket badly.

So, before witnessing a battery hot swap, here may be some information for reference.

Extracted a paragraph from one of the articles posted online for general references.

One of the advices suggesting never disconnect the battery with the engine running.

"Never disconnect the battery with the engine running. Doing a battery "hot swap" for example, in theory the surge protection diode will stop any damage from occurring, however it is very far from unknown for this diode to fail, if it does you will then need to replace the alternator..."

The mechanic worry about your car cant be start after replacement of battery...it happened on some car but not rexy..
the hot swap of battery are not advisible on our rexy...

[cute_boboi]

What my batt mechanic did is:

(1) Take a spare/old charged battery with crocodile clip.
(2) Ensure engine is off, key is out.
(3) Use the croc clip the car battery terminal cable. This is to provide juice from the spare battery when the old battery is disconnected.
(4) Loosen the cable connector, lift up. Take out the old batt.
(5) Put in new batt.
(6) Tighten back both cable.
(7) Unclip both the croc clips

Voila. Done.

[Nokia6280]

Something to share and may be good to know...

When I sent my car to a workshop for battery replacement recently.
I noticed the mechanic purposely start and leave the car engine running and replaced the battery.
I thought he was smart.

And now I know I'm stubit...because I didn't know it can impact my pocket badly.

So, before witnessing a battery hot swap, here may be some information for reference.

Extracted a paragraph from one of the articles posted online for general references.

One of the advices suggesting never disconnect the battery with the engine running.

"Never disconnect the battery with the engine running. Doing a battery "hot swap" for example, in theory the surge protection diode will stop any damage from occurring, however it is very far from unknown for this diode to fail, if it does you will then need to replace the alternator..."

From what i understand, the reason why some workshop replacing car battery with engine is running is to avoid setting lost by ECU, Radio, Power windows and etc....

Now i know a good reason to not start car engine for a battery change. Thanks!

Cute_boboi way also good as well..

[r3xt0n]

The mechanic worry about your car cant be start after replacement of battery...it happened on some car but not rexy..
the hot swap of battery are not advisible on our rexy...

The few setting that will be lost would be radio/TV station setting, memory seat setting, aircon setting if disconnect battery out. Have did that umpteen of times when fixing the solenoid valve that is located below the battery and testing Voltage Stablizer.

[kenny4744]

Hi bros,

Need your help. My rexy lights keeps flickering (very mild flicker) .
Most noticeable is the cabin door light and cockpit display at night
Any root cause?

[allan69]

Hi bros,

Need your help. My rexy lights keeps flickering (very mild flicker) .
Most noticeable is the cabin door light and cockpit display at night
Any root cause?

Bro, does that happen before strating the engine, after starting the engine or both? Check the '+' and '-' terminals connection of your battery. Measure the battery voltage if it is still healthy. It should be at around 12V before starting the engine and around 13 ~ 14V or alightly more after started the engine. This should give you an indication if either your battery or alternator is due for change

[r3xt0n]

Bro, does that happen before strating the engine, after starting the engine or both? Check the '+' and '-' terminals connection of your battery. Measure the battery voltage if it is still healthy. It should be at around 12V before starting the engine and around 13 ~ 14V or alightly more after started the engine. This should give you an indication if either your battery or alternator is due for change

Alternator can be serviced, so can try servicing before deciding to replace a new one.

[car4ktlee]

Alternator can be serviced, so can try servicing before deciding to replace a new one.

For my understanding, there are few type of ECU controlled car required resetting while battery change - the ECU will lock-out once the power is lost.
For this case, many of mechanics practice to hot-swap the battery instead of letting ECU detect fault code.

In theory, battery is acting as power supply before our engine is start (before Alternator is activate). Once alternator is run, the battery is in charging stage and shall charge battery to its optimization stage. If we step acc pedal, both will release supply to necessary parts… to sustain car operation.

Advised from my in-law, please do not acc engine while hot-swap, beware battery terminals touching etc. This may causes a lot of unknown parts fail.

For Rexton, we do not require to take risk for hot-swap because we can dismantling battery anytime we like but remember to tighten it probably… this is because if the terminal is loosen, it act as “hot-swap� stage even during we driving… so please check your terminal is tighten (not able to rotate)

regards,
Jayce Lee

[kenny4744]

Thanks guy for your advice
Will get my Alternator change

Kenny

For my understanding, there are few type of ECU controlled car required resetting while battery change - the ECU will lock-out once the power is lost.
For this case, many of mechanics practice to hot-swap the battery instead of letting ECU detect fault code.

In theory, battery is acting as power supply before our engine is start (before Alternator is activate). Once alternator is run, the battery is in charging stage and shall charge battery to its optimization stage. If we step acc pedal, both will release supply to necessary parts… to sustain car operation.

Advised from my in-law, please do not acc engine while hot-swap, beware battery terminals touching etc. This may causes a lot of unknown parts fail.

For Rexton, we do not require to take risk for hot-swap because we can dismantling battery anytime we like but remember to tighten it probably… this is because if the terminal is loosen, it act as “hot-swap� stage even during we driving… so please check your terminal is tighten (not able to rotate)

regards,
Jayce Lee