Battery powered trickle charger?

[Mr Al]

Slightly odd situation; my drive is outside next door's house so I could run a mains cable but would be a PITA. I already have an Optimate but would buy a C Tek mxs 5 if there was power.

Been looking at battery boosters and concluded that what would work best is a battery boost - jump start pack that could trickle charge through the cigarette lighter. I could then leave the car on a trickle, and remove the pack to charge from the mains (in my hallway) when out driving.

Obv I could wire in an O ring connector to the battery itself but the cigarette lighter option would remind me to disconnect.

To be clear I'm asking about trickle or conditioning not full on charging.

Any recommendations?

Cheers

Al

[Mr Al]

Thanks Pete, that's really helpful.

I had considered a solar charger as an option, especially as there's a streetlight outside so I could angle this (below) towards the light. More 'minimise discharge' than retain charge but it must help? Do these things work?

https://www.amazon.co.uk/gp/product/B00AC1LLQY/ref...

[Mr Al]

Great, thank you JKH, got to be worth a try. Amazon here I come...

[Mr Al]

Back to you Pete, another option would be a second battery - which would perform as you describe but hooked up with a diode to prevent reverse drain?

Put the temporary second battery in the boot and take out before driving. Charge in the house as before.

[Mr Al]

JKH's charger looks good, much more powerful than the AA one I linked to. Anybody have specific recommendations? The Ravpower one on Amazon seems OK but has USB output - need to work out if that will charge with my iPhone USB cigarette lighter charger i.e. the opposite way as intended.

Apologies all for my schoolboy electrics 😳 which is of course why I' m asking...