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12 Volt (12v) Toyota Prius Auxilary Battery for 2004, 2005, 2006, 2007, 2008, 2009 and 2010 with installation kitIf you need a battery for a 2000, 2001, 2002 or 2003 Prius click here. Price includes:
Superior vibration resistance! - The tightly wrapped spiral design (see cut away image toward bottom of page.) provides superior vibration resistance so you battery is less effected by pot holes, construction projects, drainage ditches speed bumps and rough roads. Pure lead! - Because of the spiral design the lead plates do not have to be strengthened with an alloy and are 99.99% pure. This results in lower voltage drop as the battery discharges and contributes to the longer life of this battery! More capacity: 2 ampere hours more capacity and 2 pounds lighter than the larger Toyota (GS) Battery for cars with Smart Key or Navigation.
The Toyota GS Battery has free liquid acid that is not absorbed in the glass mat. Consequently, it can not be easily shipped to you. So if you wait till your battery is completely dead you might have to go to the Toyota dealer near you and pay whatever price they charge. PLEASE DO NOT WAIT! HOWEVER, WE DO SHIP UPS Ground (if you are close by) and PRIORITY MAIL so we often can GET A BATTERY TO YOU IN 1 to 2 DAYS! This is the ideal battery for the Prius. We have sold them for over two years now and the battery has a less than 1% failure rate! On a Prius the 12 volt battery does not start the engine the high voltage battery does. You do not need the RED TOP battery which is chemically configured to provide a lot of starting power. Instead you need a battery that can handle the slow stead drain than occurs when the car is parked from: the clocks, the memory chips, the security system and the remote entry and key less starting system. THIS YELLOW TOP BATTERY IS DESIGNED FOR THE DEEP DISCHARGES THAT THESE SYSTEMS CAUSE WHEN THE CAR HAS BEEN PARKED FOR A WHILE. (See comparison chart below!) How much work is this to install?
Prius 2010 +: it is just two extra bolts plus the vent tube connections. Prius 2004 to 2009:
Remove floor and plastic panels. You are replacing negative cable. One extra bolt. Positive terminal replacement requires removing of one extra bolt to connect a fuse assembly. This requires a vise or long handle adjustable wrench and a long handle socket set. The nut is on tight! The mounting bracket is a little harder as it requires a socket extender because there is plastic box in front of this. You also have to disconnect and reconnect the ventilation hose that connects to the battery but that is not a huge challenge. You also have to remove and reinstall a ventilation duct. (two bolts and a little finesse [explained in the instructions]) So it is more work than a traditional car but very doable if you have the tools! Minimum tools needed: The three main contributors of premature battery failure are: This battery is made by sandwiching the acid filled mat and the lead together and then tightly wrapping them in a spiral. The eliminates the vibration as a cause of battery failure. This Yellow Top battery is also chemically configured to handle repeated deep discharges not huge starting currents. If you want a battery that lasts longer. This is it! You will pay about the same at a Toyota Dealer but this is a better battery! We offer free shipping on this battery via UPS to the Southwest and or Priority Mail to the rest of the 50 states Hawaii, Puerto Rico and other US territories! You should have your battery in 1 to 4 days!" 
_____ is Optima red top battery
_____ is Optima yellow top batterysoc-% state of charge ocv - open circuit voltage for deep cycle soc ocv 100 13.18 90 13.01 The 2004-2009 Prius has a drain of approximately 12 milliamps with smart key turned off (Thanks hobbit). After two weeks the battery would still be at 95% soc and the battery good for 10,000 cycles. However, age and heat also effects batteries. 80 12.83 70 12.65 60 12.46 50 12.28 40 12.08 30 11.89 20 11.68 10 11.48 0 11.27 Look at the graph! A battery chemically configured to take deep discharges (yellow top) has 7.5x(300/40) the life compared to the red top! The US Prius models come with batteries with Japanese size electrical posts. We provide an installation kit with new electrical connectors and a connector and plug to allow you to connect the vent holes in this battery to the vent tube in the Prius. This Optima battery can replace the Toyota 12 volt battery for the Prius with Smartkey or navigation system Toyota part number 2880021170 (GS Battery # S46B24R) or for a Prius without the Smartkey or navigation system Toyota part number 280021050. Comments from customers who have used this battery in the Prius for over a year! "The battery has performed absolutely flawlessly and is one of the best improvements you can make to a Prius . Easy to install, everything is included. In general, I am totally sold on Optima batteries; I use them for my cars and boat, my oldest one is about 10 years old and still works. Toyota puts so much emphasis on how the Pruis main battery lasts the life of the car; but what they don't tell you is that the accessory battery is a cheap ass lead acid that, even in a best case scenario, will be dead after 5 years. The Optima should correct this issue and bring the accessory electrical system to the level of the rest of the car. My factory battery died when one cell failed; the car was 1 year old at the time. As you know, Prius, with all its electronics does NOT have a simple circuit to shut down the interior light! It is therefore only a matter of time until one does not shut the door all the way and the next morning the battery is completely dead. This is what happened to me twice. When I charged the factory battery for the second time it failed. The symptoms were somewhat strange as it would still run but after sitting a few days it would not. It is good to know that with the Optima kit the chances of recovery are much better . And I don't think I'll ever have to worry about having to replace it due to age. Regards," P. G., Cherry Valley, California "I just wanted to let you know that the Optima battery in my '04 Prius has been great. We had a few sub-zero mornings last week -- the kind that in the past, with the OEM battery, had me running a long extension cord and portable charger out to where my car is parked overnight to get it started. I had been taking to turning off the keyless entry system to try and avoid a cold-morning dead battery. I found the OEM battery to be the car's achilles heel, because when it is weak, you have to resort to the physical key to get in the car, and even then you can't get the back hatch open to access the battery. But this winter with the Optima battery in place, not an issue. No matter the temperature, the car 'boots' properly, so all other systems, including the gas engine, start up without problem. I've always been a fan of Optima batteries, and adding one to my Prius brings up the 12V traditional electrics up to a quality level commensurate with the rest of the car. Thanks for a great kit to install the battery." M. A., Fort Collins, Colorado "I've had no problems since I replaced the battery. The sound system sounds great. I haven't let the battery discharge deeply (I've learned to turn off the wireless key when I'm on vacation), but I trust the yellow optima is the right battery for a deeper discharge and a good choice for this application." J. G., Monte Sereno, California From the manufacture:  The unique design of the SPIRALCELL TECHNOLOGY. provides many features not available in ordinary batteries. The following is a summary SPIRALCELL TECHNOLOGY PROVIDES: More plate surface, closer plate spacing, ability to use high purity lead. RESULTING IN: Low internal resistance. This low internal resistance gives you more power in a smaller box, ability to recharge much faster and higher cleaner voltage characteristics during discharge Immobilised plates (locked in place). RESULTING IN: Improved vibration resistance, no shedding of active paste material, lower gradual loss of power and capacity as the battery ages. This gives you a battery that lasts longer and performs better throughout its life.
The Federal Magnuson-Moss Warranty Act of 1975 prohibits a manufacture from curtailing warranty coverage due to after market parts unless it can be demonstrated that they caused the problem. (For more information click here and scroll down go to paragraphs under "Tie-In Sales" Provisions.) This sealed battery has no free liquid electrolyte because it is absorbed into the glass mat. Consequently, there is no acid that can spill into the trunk. It also has attachments for a vent hose so any gases are vented outside of the car. The battery does not normally emit gases but can do so with heavy over charging with pressure building up and the valves in the batteries releasing. This should not normally never occur because the Prius high voltage to low voltage converter puts out around 13.8 volts. 13.8 volts is the voltage the battery puts out at no load and at that voltage the battery can not be overcharged and it is the maintenance voltage for the battery. However if one cell shorts out or the voltage unexpected goes high gassing can occur. The 12 volt battery is not used to crank the gasoline engine in the Prius but it does supply all the 12 volts circuitry which includes all of the computers in your car. If this battery fails, the computers will not start and the Prius will not start. A weak battery can also pull the 12 volts power down to a lower voltage. This can cause problems with all of the computers that control your car. (When I had a problem with my car the first thing the dealer insisted I do was replace the battery. The problem was caused by something else but the battery was weak.) Since the 12 volt battery does not start the gasoline engine you can still use the car with a very weak battery. So much so that at least three Classic Prius users have told me that their Prius now gets better mileage with the new battery. I am now starting to get these stories from 2004 + owners also for example: Prius battery test procedure for 2004 to 2010 Prius Cars Here is a battery test you can perform on a Prius battery that is easy to do. It will not always detect a weak battery that does not allow you to park you car for long before it is drained down by the security system.
Included is our installation kit which includes all the parts you need and detailed installation instructions. 2004 to 2009 Prius Customer comments: "The new battery is perfect. Thanks for the kit. Installation was easy. On the OEM battery when I'd close the windows after shutting off the Power switch the battery voltage would drop to 11.8 or less. The new Optima only dips to 12.4 volts. Also the shipping was perfect. The cardboard container is very cleverly designed. Thank you for sending such a heavy item without charging and arm and leg for shipping." C. M., Bainbridge Island, Washington 
We have a battery charged and ready to ship to you! (We really do no need to charge them as we get the batteries from the manufactures warehouse and they are usually around 4 months old or less. These battery have such a low self discharge rate that they only need to be recharged once a year. We charge them anyway!) Please Note: California Proposition 65 Warning Battery posts, terminal, and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm. Wash hands after handling. |
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| Installation kit for installing Optima battery in 2000 - 2003, 2004 - 2009 & 2010 Prius US$15.00 | | | AccuMate 12 volt or 6 volt battery charger for sealed or regular batteries US$59.95 | ||
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