Jump Start Service in San Antonio, TX

A jump start in San Antonio typically costs $55 to $95. The low end is a daytime call in town with the battery under the hood. Late-night calls, trucks with two batteries, and batteries tucked under a seat or in the trunk sit at the higher end of the range.

Most of the price is the trip. A driveway in Alamo Heights is a short run from the middle of town; a ranch road west of Helotes takes longer to reach. Some cars make the job slower. Several European models and newer hybrids hide the battery in the trunk or under the rear seat and use remote jump posts under the hood, and a pickup with two batteries needs more current to turn over. The operator asks about all of that on the call, gives you one number, and that number holds unless the car turns out to need something different, like a tow.

Heat is harder on a car battery than cold, because it speeds up the chemistry that wears the battery out and boils off its fluid. In South Texas, many batteries last closer to three years than five, and they often fail with little warning.

A battery that sits under a hood on a 100-degree afternoon, parked in an open lot at the Rim or in a driveway with full sun, loses life every summer. The damage builds quietly, and the failure often shows up later, on the first cool morning in November when a weak battery has to turn over a cold engine. Short trips make it worse: a drive across town and back may never fully recharge a battery that is already weak. If the car has been slow to crank, the headlights dim at idle, or the battery case looks swollen, it is probably near the end. A jump gets you going today, and a voltage test tells you whether to replace it soon.

A jump fixes a battery that was drained, such as lights left on or a car that sat for weeks. It does not fix a battery that is worn out or a charging system that has failed. If the car dies again within a day or two, the battery or alternator needs attention.

After the jump, the operator can check the battery voltage and watch the charging voltage with the engine running. A healthy alternator usually holds somewhere between about 13.5 and 14.7 volts at idle. If the reading is low, the alternator or a loose belt is the likely culprit, and driving far could leave you stranded again. If the charging reading looks normal but the battery drops quickly with the engine off, the battery itself is the problem. Either way, drive straight to a parts store or a shop while the engine is still running, and avoid shutting it off somewhere a second jump would be hard to reach, such as the top deck of a garage.

Usually, yes, because a portable jump pack does not need a second car parked nose to nose. That helps in the Medical Center decks, the downtown and River Walk garages and apartment lots where spaces are tight. Tell the operator the garage, the level and the clearance.

Older jump methods needed a truck parked right against your bumper with cables stretched between them, which is impossible in many garages. A lithium jump pack is carried by hand to the car, clamps onto the battery or the remote jump posts and gives the starter what it needs. If the garage ceiling is low, the operator may park outside and walk in, so give the level, the row and the nearest stairwell or elevator. In big garages near the hospitals or the airport, a photo of the nearest level sign or pillar number sent as a text saves time finding you. Some garages have attendants who can help point the way.

Most hybrids and electric cars have a small 12-volt battery that can go flat and can be jumped, but only at the points the maker specifies. Never touch the high-voltage system. The owner's manual shows where the 12-volt jump posts are.

A hybrid or an electric car with a dead 12-volt battery looks completely dead: the doors may not unlock, the screen stays dark and the car will not go into ready mode, even with a full high-voltage pack. On many models the 12-volt battery sits under the hood, while others put it in the trunk with jump posts in the front fuse box. Tell the operator the year, make and model on the call so they arrive knowing where to connect. Many hybrids and electric cars should not be used to jump another car, because the small 12-volt system is not built for that load. An electric car that is out of charge needs a tow to a charger, not a jump.

Turn off the headlights, the air conditioning, the radio and anything plugged in, then wait somewhere safe and shaded. Pop the hood latch if you can do it without stepping into traffic. Have the key or fob ready, and know whether the car is gas or hybrid.

Everything left on draws power the moment the car starts, which makes the jump harder and can leave you stalled a few blocks later. In summer, do not sit in a closed car with no air conditioning; wait in shade or inside a nearby business if the car is in a lot. If you are on the shoulder of I-10 or Loop 1604, stay in the car with the belt on and the hazards flashing, unless the car is in a dangerous spot and you can get well away from traffic behind a barrier. If the battery case is cracked, swollen or leaking, or you smell rotten eggs near the hood, say so on the call. A damaged battery should be replaced, not jumped.