The OEM Battery is almost certainly an AGM. You can use an ordinary flooded lead acid Battery if you wish, but if the Battery is in the passenger compartment you should consider what happens in a collision, and the Battery get smashed. Will the acid be likely to splash on the occupants of the car or is this not a danger. I use a mobility Battery in my GS450H because they are higher capacity size for size than OEM batteries, are better built, and cheaper. The downside is the terminals are different to the standard car Battery posts.
The only thing when removing the old one for safety disconnect the negative lead first, and connect to the new Battery last.
The auto windows, sun roof, and possibly radio presets will all need to be reset.
John.
I replaced my 12V Battery on my RX400H and now my HV Control ECU is fried. When connecting my 12V Battery, I attached the positive frist and then checked the negative from the post to the terminal. Is this normal or where am I getting a 12V backfeed from?
RX400h 12v battery removal and replacement
in RX 300 / RX 350h / RX 400h / RX 200t / RX 450h+ / RX 500h Club
Posted
I replaced my 12V Battery on my RX400H and now my HV Control ECU is fried. When connecting my 12V Battery, I attached the positive frist and then checked the negative from the post to the terminal. Is this normal or where am I getting a 12V backfeed from?