How to best charge a car battery without a driveway....
How to best charge a car battery without a driveway....
Author
Discussion

TyrannosauRoss Lex

Original Poster:

36,729 posts

242 months

Friday 6th March 2020
quotequote all
Hi everyone,

I don't use my car that much and when I do it's usually pretty short trips bar the occasional motorway jaunt. I don't have a driveway and have to park on the road by the house, so short of getting a very long extension lead, I have no real access to a power supply to use a trickle charger.

Ideally I would like to just put the car on charge once per week just overnight or during the day but I'm not sure how to go about doing this? I used to have a (very good) ctek charger but since I moved house I sold it because I figured I couldn't really use it.

Any thoughts? Car is a Lexus LS460 so the battery is a fairly big one to churn over the engine plus a fair amount of electrics in the car.

Thanks!

swisstoni

24,158 posts

309 months

Friday 6th March 2020
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There’s things called battery brain and discarnect which isolate the battery.
Batteries take months/years to drain with no load.

You have to check that this was ok with your car’s alarm and all that.

Jazoli

9,681 posts

280 months

Friday 6th March 2020
quotequote all
Just buy a lithium jump starter, unless you are suffering with a flat battery all the time I wouldn't worry about it, a car can sit a very long time and not discharge its battery.

Carbon Sasquatch

5,227 posts

94 months

Friday 6th March 2020
quotequote all
Jump starter pack for emergencies & solar charger the rest of the time ?

TyrannosauRoss Lex

Original Poster:

36,729 posts

242 months

Friday 6th March 2020
quotequote all
Whilst I agree the car could sit for a while..... I do use it a few days a week when I don't cycle to work, that's only 2.4 miles each way..... So the car may do 8x2.4 mile trips in a week and only cover 10 miles. I'm pretty sure that would drain the battery more than just not leaving the car.... Wouldn't it?

Cheers!

Demelitia

689 posts

86 months

Friday 6th March 2020
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TyrannosauRoss Lex said:
Whilst I agree the car could sit for a while..... I do use it a few days a week when I don't cycle to work, that's only 2.4 miles each way..... So the car may do 8x2.4 mile trips in a week and only cover 10 miles. I'm pretty sure that would drain the battery more than just not leaving the car.... Wouldn't it?

Cheers!
Any chance you could charge it at work?

The solar battery maintainers are handy. The 12v sockets in my dads car are constant live so he puts his on the parcel shelf and plugs it in when he gets out of the car at work. His commute is just under 2 miles. I’ve no doubt the amperage draw on your Lexus is a lot more than my dads old Passat, but you could go for a larger solar panel and see how you get on?

TyrannosauRoss Lex

Original Poster:

36,729 posts

242 months

Friday 6th March 2020
quotequote all
Do the solar chargers require the cigarette lighter to remain live with the vehicle locked? I'm not sure if any of them in the LS460 do this?

sunbeam alpine

7,250 posts

218 months

Friday 6th March 2020
quotequote all
Sorry if it's a stupid question, but is it a big job to take out the battery on a Lexus?

You could charge it in the house and would be a very effective theft deterrent! smile

TyrannosauRoss Lex

Original Poster:

36,729 posts

242 months

Friday 6th March 2020
quotequote all
sunbeam alpine said:
Sorry if it's a stupid question, but is it a big job to take out the battery on a Lexus?

You could charge it in the house and would be a very effective theft deterrent! smile
That's a pretty good suggestion, but it's a reasonable faff (involves removing several trim pieces under the bonnet) and it's also a pretty heavy old thing as it's a battery for a 4.6 engine. I think that removing the battery would also reset all of my settings such as saved radio stations, clock time etc etc frown but otherwise yes, that would be a good idea! smile

Demelitia

689 posts

86 months

Friday 6th March 2020
quotequote all
TyrannosauRoss Lex said:
Do the solar chargers require the cigarette lighter to remain live with the vehicle locked? I'm not sure if any of them in the LS460 do this?
It’s not mandatory, they usually come with a set of cables with croc clips or some to hard wire in even. The issue being you have to run them out of the door seal or through some sort of grommet in to the engine bay.
Plugging it in to the 12v outlet was just the most convenient in my dads car.

Scootersp

4,125 posts

218 months

Friday 6th March 2020
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Perhaps buy one of those decent mini portable battery packs, some have leads with clips that can be attached and remain attached to the battery terminals and The other end with quick attach/release connectors could be feed though the plastic covers on the Lexus. Then you can use the car until the battery struggles, jump it using that and then either

take it for a good run to recharge it
have an extension lead and fast charging mains battery charger and clean/hoover it for an hour or so (this depends on the road/house/neighbourhood)
Buy a second battery and swap it in when the first one needs a jump and charge it indoors.

You aren't leaving it that long between uses, has it let you down much so far. I understand it's not getting much of a run when you do but it would be interesting to know what the minimum usage a car like that needs to just sustain the battery

petrolfred

27 posts

92 months

Saturday 7th March 2020
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Same dilemma for a family member who only does short journeys. I use a spare battery and a small rc model charger.
Will happily charge at 3-4 amps for a few hours which keeps her going for several months.

TyrannosauRoss Lex

Original Poster:

36,729 posts

242 months

Saturday 7th March 2020
quotequote all
Scootersp said:
Perhaps buy one of those decent mini portable battery packs, some have leads with clips that can be attached and remain attached to the battery terminals and The other end with quick attach/release connectors could be feed though the plastic covers on the Lexus. Then you can use the car until the battery struggles, jump it using that and then either

take it for a good run to recharge it
have an extension lead and fast charging mains battery charger and clean/hoover it for an hour or so (this depends on the road/house/neighbourhood)
Buy a second battery and swap it in when the first one needs a jump and charge it indoors.

You aren't leaving it that long between uses, has it let you down much so far. I understand it's not getting much of a run when you do but it would be interesting to know what the minimum usage a car like that needs to just sustain the battery
Hasn't let me down so far..... Until I was in the car last night fiddling about and downloading new stuff over the infotainment system I got fitted with the ignition on for about 45mins until a warning light came on saying low battery hehe

So totally my fault, got AA to use a battery starter thing, it fired up straight away and then I took it for an hours drive.

Cheers.

Miserablegit

4,449 posts

139 months

Saturday 7th March 2020
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Stick a hybrid badge on it and run a power cable from a roadside charger...

finishing touch

818 posts

197 months

Saturday 7th March 2020
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Miserablegit said:
Stick a hybrid badge on it and run a power cable from a roadside charger...
clapclapclap

TyrannosauRoss Lex

Original Poster:

36,729 posts

242 months

Saturday 7th March 2020
quotequote all
Miserablegit said:
Stick a hybrid badge on it and run a power cable from a roadside charger...
laugh

SHutchinson

2,384 posts

214 months

Saturday 7th March 2020
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TyrannosauRoss Lex said:
Whilst I agree the car could sit for a while..... I do use it a few days a week when I don't cycle to work, that's only 2.4 miles each way..... So the car may do 8x2.4 mile trips in a week and only cover 10 miles. I'm pretty sure that would drain the battery more than just not leaving the car.... Wouldn't it?

Cheers!
That’s almost the exact use profile of my Audi S5, never had an issue with the battery in 6 years.

Evoluzione

10,345 posts

273 months

Saturday 7th March 2020
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Sounds like you're looking for a solution to a problem you don't have.

TyrannosauRoss Lex

Original Poster:

36,729 posts

242 months

Saturday 7th March 2020
quotequote all
OK, thanks everyone smile I should just stop looking into things biggrin

ninjag

1,945 posts

149 months

Tuesday 10th March 2020
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It's also worth noting that most of those power banks which are used for jump starting the car won't work as a battery charger or maintainer because they are only 12V output and you need a higher voltage to charge a car battery, usually around 14.5V.

I've seen a few which say they can output 15V and 19V but I'm not sure I would trust them.