Battery acid is eating exhaust shield

i would reduce the use of b mode, i never use it. but we don't have the hills you do. then again, 2010's are notorious for bad batteries. you may have solved it by adding water, or you may want to replace it prophylactically.

 

I don't think that's from use of B-mode. I'd be at the dealer demanding warranty covered work.

 

Maybe you should replace your battery.

Galaxy Nexus ? 2

 

I'd still check. The below info is copied from
Warranty Coverage Information 2010 Toyota Prius | Prius 3

The 2010 Prius warranty can be broken down into several areas of coverage. Like most vehicles on the road today, it starts with the popular 3 year or 36,000 mile “basic warranty”. Most likely in an effort to instill trust, Toyota adds additional warranties to cover the hybrid system and other systems.​

Basic Warranty: 36 months or 36,000 miles, whichever comes first. Covers repairs and adjustments to correct defects in materials or workmanship of parts supplied by Toyota. Wheel alignment and wheel balancing are an exception to the rule, only getting covered for 12 months or 12,000 miles.​

Hybrid System Warranty: 96 months or 100,000 miles, whichever comes first. This warranty includes the Battery Control Module, Hybrid Battery, Hybrid Control Module, and the Inverter (with converter).​

Powertrain Warranty: 60 months or 60,000 miles, whichever comes first. This includes the Engine (cylinder block, head, internal parts, timing gears & gaskets, the timing chain/belt, valve covers, oil pan, oil pump, engine mounts, engine control computer, water pump, fuel pump, seals and gaskets). It also covers the Transaxle, Motor, and Generator (case, all internal parts, transaxle mounts, seals and gaskets). It covers the Front-Wheel Drive System (drive house and internal parts, axle shafts, drive shafts, CVJ, front hub and bearings, seals and gaskets).​

Restraint System Warranty: 60 months or 60,000 miles, whichever comes first. This covers the vehicle for any repairs needed to correct defects in materials or workmanship on seatbelts and/or air bag systems.​

Corrosion Perforation Warranty: 60 months regardless of mileage. This one is for repair or replacement of any body panel that develops perforation from corrosion (aka rust through).​

 

Gee I am confused...I thought Prius used AGM batteries which no user maintenance requirement for filling cells with water. Are we talking about the orig 12v battery here? How often have you filled the cells?

 

I'm thinking your frequent top-ups are the cause.

 

My guess is either your battery case is leaking or there's some spillage of electrolyte as a result of topping off the battery.

Galaxy Nexus ? 2

 

What is OEG and why filling so often?

 

Think he means OEM.

 

This sounds like a battery over charging. The only thing that could cause a problem like this would be a shorted cell in the battery or a faulty voltage regulator in the alternator. Change the battery first of all then check the charge voltage. If it is over 14.2 v max then the alternator is running wild.

 

That's a lot of water.
Somebody correct me, but I am thinking this batt is not supposed to be filled with water.
I googled this pic, seems to be from Prius Chat. I don't know if this is your exact batt, but first line says "Never add water". So that could be the problem.

You want to get a new 12v battery and you are going to have to check for damage that needs to be repaired.
I checked my Gen2 op manual for info they were silent on adding water to batt. However, my Gen2 repair guide says it is maintenance-free because not much H2 is created when charging. Now that you have added water, it is probably making H2 gases when charging which is potentially unsafe situation.

 

As a service for dyslexics:

 

The "pads" between the plates should -just- be wet. No liquid above them. You are not seeing the plates, just the "pads" or mats. It's an AGM (absorptive glass mat) battery.
You have probably lost acid from over-filling the battery. Time for a new battery.
If you are going to add water, once every two or three years is enough, and add just enough that the "pads" can be seen to be soaked. NO liquid above the "pads" please!

Hey, that battery in the photo has a warranty! It's got to be good for four years, but probably a pro-rated replacement.

 

Did you buy the car new or used? If used, then someone replaced the AGM battery...