Lozsta

Really I am looking for a different battery to put in that doesn't require a trickle charge/bnattery tender/odb connected solar panel/screw top disconnector. There has to be a battery out there which will not discharge overnight or within 24 hours.

Hi Russell thanks for the advice but this review unfortunately counters the use quite well "Don't waste your time and money on this junk. It might be fine for a leisure battery or something that does not move about but it is not sturdy enough for a car. The thing is poorly made, does not clamp over battery terminals securely without a shim. I removed mine after a couple of months as it was causing electrical issues with the car. Connection was not secure enough and components were not getting sufficient power."

A jump pack? I wasn't aware that you can jump the rx400h due to the big battery. I have a solar panel and the ODB port but it doesn't seem to help. I am looking more for a higher MAh battery like a leisure battery that will hold charge longer.

Hopefully someone can help me. My old rx400h is great most of the year round. Unfortunately due to my not daily use the battery discharges very quickly in cold weather. I have to buy a new battery yearly and then the next year it will discharge within 48 hours of a temp drop. I read a while back about this causing issues with the car not wanting to start properly and giving the ACS (cant remember the details exactly) error when starting, it keeps asking you to put it in park when it it. I am hoping someone has the knowledge required to help me, I did read that some were using leisure batteries or similar with higher mAH ratings to help with slowing the rapid cold weather discharge. There were others who mentioned issues with this but I am really hoping I can make it through one following winter without the cost of a new battery. Thanks in advance for any help :)

Ok cool, thank you. Excellent analogy Colin, putting it that way makes me feel like an idiot because it is such a simple thing.

Thanks @Gliderpilot I got one from the local Costco for £50 and change so that was a bonus. Now to wait for them to run an offer on tyres...

@Herbie I am no expert on car batteries or cars in general, computers/cloud computing/bioinformatics/clinical trials maybe but cars remain a mystery... In that case if I were to buy one of the higher Ah batteries this would not cause complications?

@GSLV6 thanks, I have gone for the Bosch aux battery that was recommended, I have looked at the deep cycle battery but I am not sure I understand how it would charge back up as they are designed to discharge then charge back up. I got the right battery from Costo for £50 and change so we will see how it gets on.

I have not had the battery tested, it just seems to lose enough charge and the "start in P" error comes up, I have checked the inverter recall for my reg/VIN and it comes up wih nothing needed but whether I believe it or not... What battery did you buy I am looking for the one gliderpilot recommended a Bosch S4 021 which looks right but the parts checker on amazon says it does not fit (not that reliable). I am having a right ball ache trying to find the right one...

@Gliderpilot sorry to bother you again, I am wondering do you think that battery would be the right one for the 2006 model, I am guessing it would be.

Thanks that has confirmed what I thought, I was going to go for Varta but I believe these are their batteries with a new badge.

@Gliderpilot can you confirm what your battery is in the 400h please.

Thanks for the information @Rutlandlex. Main update is that the aux battery is the issue. Over time it does not seem to get charged by the engine/traction battery so I am having to take the battery out, charge it over night and then the car is magically fine in the morning. Currently I am trying to find the right battery to replace in the car. Lexus aren't particularly helpful they just gave me the information "B24" on the battery and that is it. Someone pointed out something very interesting about why the aux battery issue on the SE-L where the battery is not up to the job, relating to the Japanese culture and having to accept that there is an issue.

Don't tow it away it will need to be on a car carrier (the manual specifically says not to tow the vehicle).

Surely though if there was insulation in there before then it should be insulated against the cold, I have had the battery out now in the last month 3 times to charge. Strange thing is the smart charger only shows a low 1-3 on the scale for power draw. Yet charged overnight back in the car and it goes to ready straight away. Today I have the solar panel from the AA in the OBD port to see if that helps... i am still unable to find the correct battery for this vehicle in the Varta Catalouge, I am ordering on of their blue tops as they seem highly recommended. EDIT also discarding a $54 part would seem a little wasteful...