jl5

Thanks for your reply Steven! I figured that I'd take a shot at replacing the bad modules and see if I can do the repair myself, learn some new skills, and save a few bucks before ordering a new or reconditioned battery. So far, after pulling the battery out. I've tested the voltages and found at least one bad cell. All the voltages were around 8.1 - 8.06 volts except for one obvious module which clocked at 6.78v. I'm assuming this module is the one that set off the CEL (Check VSC, Check EBC, Check Hybrid System) and threw the following codes when voltage difference threshold is exceeded: P0A80 P3017 P0A7F Afterwards I load tested each module with a headlight bulb drawing 4.3 Amps and measured the voltage drop after 10 minutes and found another cell that had a relatively significant voltage drop compared to the other modules (-14.5% drop, compared to an average of around 8-10% of all the others). It also had a lower starting voltage of 7.69 as opposed to other modules which held between 7.79-7.83 volts (battery sat for about a week at this point). Right now I'm in the process of cycling deep discharge/charging, re-peaking, and then fully discharging again to chart out the capacities of all the batteries and again seeing if there are further bad modules and restoring capacity to whichever ones I can. Afterwards I'm planning to balance the battery by matching the similar strength batteries with one another and then replacing them in the car. I'm trying to do it properly the first time and if I'm successful then I would like to share what I've done to help out fellow GSh owners. My problem right now is figuring out which batteries to order, and which Toyota/Lexus models are compatible with my GS450h. So far it seems like all gen 2 batteries are compatible which I will have to order at least two of. I just wanted to make sure and see if anyone had any knowledge on which models specifically are for sure compatible so I can place the order with peace of mind and not have to worry about waiting 2 weeks for an incompatible module. Of course I don't recommend it as a DIY to those who aren't at least a little mechanically inclined, but the entire process so far has not been too difficult. I'll be sure to follow up with updates on how it goes! Thanks again for your advice, much appreciated!

Hey guys. So I just purchased an 07' Lexus GSh for $5k CAD knowing that it will need the hybrid battery rebuilt. It was imported from California with 83k miles or about 134k kilometers. I've already pulled everything out, tested voltages, load tested, and am currently cycling the modules right now. My question is, which hybrid batteries (Toyota/Lexus) are compatible with an 07' Lexus GS450h? I'm getting a lot of mixed feedback researching online. Some people are saying if switching to gen 3 packs that it is best to switch all the modules together, while a Toyota tech says that Gen2/Gen3 batteries are interchangeable. There are also differences in the batteries between 05-07 and 08-11 GS450? I'm a little lost here and don't want to be buying batteries I don't need, so is there anyone here who knows which Toyota/Lexus hybrid batteries are compatible with my car? Thanks in advance for any help!