Desk sheet - Battery
What a Month of Standing Does to a Battery, and Why Nobody Here Touches It
The most likely thing to go wrong on a long stay, and the one where the refusal on this desk is most likely to annoy somebody. Both halves are worth explaining before you book a month rather than after you come back.
01Two things are happening at once
A battery loses charge on its own. Every battery does, and a modern vehicle also draws a small current continuously for alarms, keyless entry and various modules that never fully sleep. Over a month that adds up.
Heat is hard on batteries. Cold gets the reputation, because cold is when a weak battery finally refuses to start an engine. Heat is what made it weak. A battery that spends a Tucson summer standing outdoors ages faster than the same battery in a mild climate, and the effect is cumulative across seasons rather than dramatic in one stay.
Put together: a healthy battery usually survives a month of standing here. A battery already near the end of its life often does not, and a hot month is what finishes it.
02What to expect on return
| Length of stay | A healthy battery | A battery near the end of its life |
|---|---|---|
| A few days | No change at all | Fine |
| A week to two weeks | Starts normally | Usually fine, occasionally slow |
| Three to four weeks | May crank slowly for a second, then start | Quite likely to refuse |
| Over a month, in summer | Usually starts, sometimes slowly | Likely to refuse |
None of those rows is a prediction about your car. They are the pattern a desk sees, described as a pattern.
03What this desk does about it: nothing, and why
No jump start is arranged, no charge is put on a battery, no terminal is touched and no trickle charger is connected. It is one of the five refusals and it is the one that annoys people most, so here is the actual reasoning rather than a policy line.
It is somebody else's vehicle and somebody else's electrical system. A jump start done carelessly on a modern car can be expensive in a way that has nothing to do with the battery, and nobody at a parking lot is in a position to take that risk on your behalf.
We do not own the ground or employ the attendant. Even if a lot were willing, arranging it would mean this desk promising an act performed by a person we do not employ on equipment we do not own. That is exactly the kind of promise the claims sheet refuses to make.
There is a better answer that costs nothing. Roadside assistance, if you have it, or a call to a local service. Both are available in a parking lot and both are people whose job this actually is.
04What is worth doing before a long stay
- Know how old the battery is. If it is over four years old and you are leaving it for a month in summer, that is the single most useful fact on this page.
- Do not leave anything plugged into a socket. A dash camera, a phone charger, a tracker. Some sockets stay live.
- Make sure the vehicle is properly locked and closed, so nothing keeps a light or a module awake.
- Have a plan for the possibility. Not an arrangement with us, because there is none, but a number in your phone.
What is not worth doing: disconnecting a terminal yourself before a stay in a public lot. On many vehicles that loses settings and on some it triggers a security state, and doing it in a parking lot at five in the morning is worse than the problem.
05What this means for the reservation you should make
The band matters and the grade barely does.
- Under four days: irrelevant.
- A week to two weeks: irrelevant for a healthy battery.
- A month and over, May to September: the one case where the age of the battery should influence whether you leave the car at all. If it is old, this is the stay that finds out.
Shade does very little for a battery. Do not buy a canopy for this reason; buy it for the dashboard.