Preventive maintenance on HV Battery (replacement)

I went and got myself a new(er) 2012 GenII battery today from a car that broke down (bad transaxle) with 400,000 miles. The battery was newly purchased in 2012 from Toyota. I want to install this in my 2005 which has the original HV battery from the factory. Although it's still working, I just want to do some preventive maintenance here.

My questions that I have are:

1. The new(er) battery has sat for about a month and only shows 1 bar on the MFD SOC when I removed it from the car. Do I have to charge this battery before installing?
2. My 2005's battery is still good, do I have to worry about it going bad if I let it sit after removing it? I do plan to sell this battery on since this is currently a working battery with no issues.

Thank you all for reading this......

 

I have this fear of getting stranded when I leave on a roadtrip. Doing this swap now with a newer 2012 battery gives me the peace of mind to travel worry free with a lesser chance of battery failure when I'm out of town.

SM-N900P ?

 

I was reading another thread just this week that mentioned the owner left their car sitting for 2 weeks or a month and the HV battery got a weak module. Although I believe the module was already weak, I just don't want this scenario to happen with my 2005 battery. It works perfectly since it's driven daily, but what if I take it offline for a month?

 

I'm taking it apart now and I notice something really strange, the replacement newer battery has a bunch of Chinese/Japanese stickers on it, the original battery only has an English label on it. Even the part numbers are different.

From 2005 - newer purchased in 2012 replacement part #g9510-47031
Old 2005 battery part #g9280-47100

 

You might have misunderstood what I meant. The car it came from is a 2005 with 400000 miles. The car had the battery replaced and worked for 2 years (since 2012). Just now, transaxle failed and I purchased the battery.

I have it installed now but I hear a clicking noise whenever it starts....like it clicks to boot up. I've never heard this battery with all the seats removed, maybe that click was there before and I didn't know about it?

 

I don't have testing equipment. I'm not removing any of the modules....this is like getting a good battery shipped to you and swapping it in. Nothing more.

 

All done. Wow that was more difficult than I had thought. I had a tough time putting back the plastic vent going from the fan. Spent 30 minutes trying to push that thing in place. I must've been doing it wrong, it came out like butter but was a B**ch to put back.

Strange thing about the 2 different part numbers, the newer part number is available to purchase.....but the original one from the car, part G9280-47100 is not searchable in the Toyota parts catalog.

I did open up the case to take a quick peek, noticed the original batteries have a serial number on each module, they are all in numerical order. I guess you can tell if you have a refurbished battery if those numbers are not in order.

 

One thing I did notice from the 2 year old battery I bought, when I opened up the case, there was lots of clumped up lint like material around the modules. I think the person that had the 400k mile car had a really dirty fan and it kept blowing lint into the battery case. His 2005 battery quit in 2012, only 7 years of service, might have overheated and module went bad.

I'm thinking the people that find their battery fan and duct work really dirty, they should have a service to open up the battery and get all the crap that's built up in there. Cleaning the fan and duct work won't do much if it has already blown tons of lint like material to heat up the modules into the battery case.

Question for the battery rebuilders that are reading this, does this seem like it occurs often when you open up the cases when you rebuild?

 

I've driven on this battey for a week now and I seem to not get as good of gas mileage as my old battery pack. Does the battery ECU have anything to do with fuel economy?

The battery seems to work perfectly, not sure why I would lose 4mpg with this new pack.

 

After an entire month of running on this new battery, it still doesn't offer as good of MPG as the original battery. I do notice that the car does not charge up to green bars as easily now. Maybe the battery is newer and the cells are stronger, but definitely not seeing as much green bars as before. It's always at the top of the blue bars.

Would an older battery offer better gas mileage because it's showing a "full charge (green bars)" more easily than a newer battery that doesn't charge up as quickly? Like an old laptop battery would charge fully in 1 hour vs a new laptop battery would take 2.5 hours to charge fully?