I never disconnect neg when charging - never. Just connect red to Pos and black to Neg ON the battery - don't diddle daddle causing them to spark just attach it fast and accurately where it has a firm grip then turn unit on and set to correct battery type - done.

 

Hi man, thanks for that. I've seen videos and other forums where they say that it should never connect to the negative terminal, rather to the body, which just confuses me more. so much conflicting advice it's hard to know what's correct.

 

Do I have to take special steps to protect the battery of my hybrid vehicle if I plan to store the vehicle for an extended period?

In addition to the storage tips for our conventionally-powered vehicles, our hybrids require additional steps for each battery, as the hybrid vehicle battery and auxiliary battery will discharge and their condition is liable to decline.

To prevent excessive auxiliary battery drainage, charge the battery at least once every two weeks by powering on the hybrid system for 20 minutes with all non-essential electrical accessories (such as air conditioning and audio equipment) turned off. It is not necessary to drive the vehicle, but do not start the hybrid system in an enclosed area unless the tail pipe is connected to an exhaust hose to prevent harmful buildup of fumes. As an alternative, you may disconnect the negative terminal of the auxiliary battery.

For the hybrid vehicle battery, charge the battery at least once every two months by starting the hybrid system for about 30 minutes*. Check that the "ready" light is on and all lights and electrical accessories are off. As with the auxiliary battery charging, it is not necessary to drive the vehicle, but the steps to prevent exhaust buildup must be taken.

* If the auxiliary battery was disconnected, it will have to be reconnected before the hybrid system is started.


What should I do to prepare my Toyota vehicle for long-term storage (1-6 months)?

Our minimum recommendations for long-term storage of conventionally-powered vehicles are listed below:

TOOLS AND SUPPLIES:

• Wrench
• Tire pressure gauge
• Tire pump
• Jack
• Jack stand or blocks
• Vehicle cover
• Towels or shop rags

INSTRUCTIONS:

Before storing the vehicle:

• Have the engine oil changed
• Have the engine coolant changed if due during time of storage
• Fill up the fuel tank with the appropriate gasoline for your vehicle
• Wash the vehicle; use high pressure water or steam to clean underneath
• Check underneath the floor mats to ensure the carpet is dry
• If there are any paint chips, have them repaired

When storing the vehicle:

• Operate the engine at normal operating temperature* for 15 minutes prior to shutting off the engine
• Disconnect the black negative (-) battery cable
• Leave the parking brake off
• Raise the vehicle on a level surface and place on jack stands or blocks to prevent flat spots on the tires
• If stored in a temperate, ventilated garage, the windows can be left slightly open
• Cover the vehicle
• Operate the air conditioning once a month to ensure proper lubrication

When bringing the vehicle out of storage:

• Have the battery charged and reconnect the black negative (-) battery cable
• Check fluid levels and add as needed
• Check for any leaks underneath the vehicle
• Check and inflate the tires to the correct pressure before taking the vehicle off the jack stands or blocks
• After starting the engine, observe the warning lights; if any remain illuminated, have the issue addressed by your Toyota dealership as appropriate
• Check the brake pedal for normal feel (height and firmness) before shifting the transmission
• Take the vehicle to your local Toyota dealership for general inspection

* To determine your vehicle's normal operating temperature, please refer your Owner's Manual.

Home (toyota.com)

 

Hi man, I appreciate the good info in that text. However it doesn't help clarify the situation with charger connection points.

 

For the time frame your describing I think Toyota is saying with the negative cable dis-connected there's little chance of sufficient battery drain to require a battery tender. I regularly put my MR2 in storage for 6-8 weeks at a time and I don't even take the negative cable off. Been doing this since 2007 and have never even had to jump the car when I went to get it. Last Interstate battery lasted 9 years and I changed it out over my own paranoia.

 

Hi what you end up doing? I am in same situation with my highlander Hybrid

 

Under the hood fuse box has large bolt in the center of it. That's your (+)
Negative will be any metal ear on the engine.
Just don't forget, you also have traction battery, that can be charged only when vehicle is driven. 12V is only power bank for electronics.