A battery-powered GPS tracker for your car does one thing a plug-in tracker can't: it works anywhere. No port, no wires, no connection to your car's electrical system. Charge it, put it where it makes sense, and you can see where your car, trailer, or equipment is from your phone.
That freedom is exactly why ShadowTrack is our most-reviewed tracker. This guide explains how a battery tracker works, what "up to 15 days per charge" really means day to day, where to place one so it keeps a clear signal, and when you'd be better off with a plug-in tracker instead.
A battery-powered GPS tracker runs on its own rechargeable battery, so it works on anything you own: cars without an OBD-II port, trailers, boats, equipment, or a car where you want the tracker out of the obvious spot. The trade-off is charging. ShadowTrack runs up to about 15 days per charge and costs $69.90 plus a monthly fee, with no contract.
What this guide covers:
How we put this guide together
This guide is based on how ShadowTrack and the ShadowGPS app work, on 134 verified on-site ShadowTrack reviews (averaging about 4.6 out of 5), and on the questions our support team hears most from new owners: how long the battery really lasts, where to put it, and whether there's a monthly fee.
What Is a Battery-Powered GPS Tracker?
A battery-powered GPS tracker is a self-contained tracker with its own rechargeable battery. It uses GPS satellites to find its position and a built-in cellular connection to send that position to an app on your phone. Because it doesn't draw power from your car, you can place it almost anywhere and move it between vehicles whenever you like.
That's the key difference from the two other common types:
- OBD-II trackers plug into the diagnostic port under your dashboard and draw power from your car. No charging, but they only work on vehicles with that port.
- Hardwired trackers are wired into your car's electrical system. Permanent, but they usually need a professional and tools.
- Battery trackers like ShadowTrack need no port and no wiring. You trade that freedom for a charging routine.
Why ShadowTrack Is Our Most-Reviewed Tracker
ShadowTrack has more verified reviews on our site than any other ShadowGPS tracker, and the reasons owners give are consistent. It works on things a plug-in tracker can't reach, it sets up in under two minutes, and it gives you the same live map, trip history, and alerts as our plug-in tracker.
If you've searched for a hidden GPS tracker for your vehicle, this is usually what you're after: a tracker that isn't sitting in the one spot everyone knows to check. A battery tracker can go under a seat, in the trunk, or on a trailer frame.
The live map is where most owners feel the difference first. ShadowTrack updates every 5 seconds while it's moving, so you watch your trailer or car follow the road instead of jumping between blocks. Then the trip timeline and trip replay take over, showing you every route afterward, stop by stop.
ShadowTrack
- Rechargeable, up to about 15 days per charge
- Weatherproof magnetic case, set up in under 2 minutes
- Live tracking, trip replay, geofences, Share Location
Best for: trailers, boats, equipment, classic or stored cars, and any car where you'd rather the tracker not sit in the obvious spot under the dashboard.
Battery vs. OBD-II vs. Hardwired GPS Trackers
Here's how the three types compare on the things that matter after you buy.
| Type | Power | Setup | Upkeep | Easy to spot? | Works on |
|---|---|---|---|---|---|
| Hardwired | Car's electrical system | Usually needs a pro and tools | None | Hard to spot | Cars and trucks with wiring access |
| OBD-II (ShadowAuto) | Car's OBD-II port | Plug in, under 2 min | None | Easier, the port is a known spot | Cars and light trucks from 1996 on |
| Battery (ShadowTrack) | Own rechargeable battery | Charge, place, pair, under 2 min | Recharge about every 2 weeks | Harder, it can go almost anywhere | Cars, trailers, boats, equipment |
For a deeper side-by-side, see our guide to OBD2 vs. battery-powered GPS trackers.
Battery Life: What "Up to 15 Days" Really Means
ShadowTrack runs up to about 15 days on a full charge. Your real number depends mostly on one thing: how much it moves. A tracker sending live updates on a daily commute works harder than one sitting on a parked trailer all week.
Three factors shape your battery life:
- Driving time. More hours on the road means more live updates and faster drain. A car that's driven daily will land at the shorter end of the range.
- Signal strength. In weak-signal spots, the tracker works harder to connect. Underground garages and rural dead zones cost more battery.
- Temperature. Like any lithium battery, very cold weather shortens run time between charges.
The simplest routine owners stick with: charge it every other weekend, or whenever you check the battery level in the app before a long trip. For more on what drains trackers, read how long GPS tracker batteries last.
Need zero charging?
If remembering to charge sounds like a chore and your car has an OBD-II port, a plug-in tracker is the easier fit. It's powered by your car, so there's nothing to recharge, ever. Many owners run both: a plug-in tracker in the car and ShadowTrack on the trailer.
Where to Place a Battery GPS Tracker
A tracker needs a reasonably clear view of the sky to get a GPS fix and a cellular connection to report it. Thick metal blocks both. The best spot balances signal, protection, and a place you can reach easily to recharge.
Good places for ShadowTrack
- Inside your car: under a seat, in the trunk liner or spare tire area, or in a door pocket. Plastic and fabric don't block the signal much.
- On a trailer: on a flat, clean steel section of the frame, in the weatherproof magnetic case, away from the tires and the hitch.
- On equipment or a boat: inside a plastic compartment or under a seat cushion, away from the engine.
Places to avoid
- Inside a fully closed metal toolbox or glovebox lined with metal, which can block the signal.
- Near the exhaust, engine, or other heat sources.
- Near moving parts like suspension or driveshafts, or anywhere road debris hits hard.
After placing it, take a short drive and check the app. If the trip shows up cleanly, you've found a good spot. Accuracy in open sky is very good; the official GPS.gov accuracy page explains why buildings, garages, and heavy metal affect any GPS device.
How to Set Up ShadowTrack in 3 Steps
- Charge it. Use any standard USB charger until the tracker shows a full charge.
- Pair it. Download the ShadowGPS app and add your tracker. It has cellular service built in, so there's no SIM card to buy or set up.
- Place it. Put it in its magnetic case or inside your car, then take a short test drive to confirm the trip appears.
That's it. No tools, no wiring, no appointment. If you ever move it to another vehicle, just place it there; nothing needs to be redone in the app.
What You Can Do With ShadowTrack
ShadowTrack uses the same app as our plug-in tracker, so you get the full set of tracking features:
- Live tracking: see where your car, trailer, or equipment is right now.
- Trip timeline and trip replay: scroll through past trips and replay any one on the map.
- Geofences: get an alert when it enters or leaves a zone you draw, like your driveway or a jobsite. Here's how to set up geofence alerts that catch overnight movement.
- Speed alerts: useful for a new teen driver.
- Share Location: send a live link to someone picking up your trailer or car.
- Web + app: check from your phone or a laptop.
Who ShadowTrack Is Best For
Trailers, boats & equipment
No OBD-II port, no problem. Know where your utility trailer, boat, or jobsite equipment is overnight.
Classic & stored cars
Older cars and cars in storage often lack a port or sit for weeks. A battery tracker doesn't touch your car's battery. See our classic car guide.
Turo hosts & small fleets
A second tracker out of the obvious spot, or one tracker you move between vehicles. More on our Turo hosts page.
ShadowTrack or ShadowAuto?
If the thing you want to track is a car or truck you drive every day, our plug-in tracker is often the easier choice. ShadowAuto plugs into your OBD-II port, runs on your car's power, and adds features that need that connection, like Car Alarm and engine codes. ShadowTrack wins whenever there's no port, or when you want a tracker that can move or sit out of sight.
ShadowAuto
- Plugs in under 2 minutes, never needs charging
- Car Alarm and tamper alerts
- Engine codes on your phone
Best for: the car or truck you drive every day, when you want a tracker you never have to think about charging.
What ShadowTrack Costs
Here's the full picture, with nothing hidden.
| How you pay | Upfront | Ongoing | First-year total |
|---|---|---|---|
| Device + monthly plan | $69.90 | $12-$15/mo, no contract | About $214-$250 |
| 4+ trackers | $69.90 each | $10-$13/mo per tracker | Varies by count |
| Prepaid 1-year bundle | $213.90 | No monthly bill during the term | $213.90 |
ShadowGPS pricing as of October 2026. Prepaid 3-month and 3-year bundles are also available on the ShadowTrack prepaid page. See current pricing.
Is there a monthly fee?
Yes. ShadowTrack sends its location over a cellular connection, and the monthly fee pays for it. No contract: month-to-month, or prepay and save. Cancel any time, and the 30-day money-back guarantee covers your first month.
Is it legal to put a battery GPS tracker on a car?
On a car, trailer, or equipment you own, yes, across the US. Placing a tracker on a vehicle someone else owns or mainly drives is different. That includes a spouse's or partner's car, even one you co-own, and many states have specific GPS or anti-stalking laws that apply. ShadowTrack is built for protecting property you're responsible for, not for following a person. If you're unsure, check your state's law or ask a lawyer. We're not lawyers, and this isn't legal advice.
FAQs: Battery-Powered GPS Trackers
Is there a monthly fee for a battery-powered GPS tracker?
Yes, for real-time tracking. The tracker uses a cellular connection, and the fee covers it. ShadowTrack plans run $12-$15/mo, or $10-$13/mo per tracker with 4 or more. No contract: month-to-month, or prepay and save.
Does ShadowTrack need a SIM card?
Not one you have to buy. Cellular service is built in, so there's nothing extra to set up. More in does your GPS tracker need a SIM card?
How long does the ShadowTrack battery last?
Up to about 15 days per charge. It lasts longer on a trailer that mostly sits parked and less on a car driven every day, in weak-signal areas, or in very cold weather.
How do I charge it?
Take it out of its case or spot and connect it to a standard USB charger. Most owners charge it every other weekend so it never runs low.
Does it keep working if my car battery dies?
Yes. ShadowTrack runs on its own battery, so a dead or disconnected car battery doesn't affect it. It also never draws power from your car.
Can I put it on the outside of my car or trailer?
Yes, in its weatherproof magnetic case on a flat, clean steel surface away from heat, tires, and moving parts. Check the spot now and then, especially after rough roads.
Can a battery GPS tracker be found?
Yes. A careful physical search or an RF detector can find any GPS tracker. A battery tracker is simply harder to spot than a plug-in, because it isn't in a known location. Here's how to find a tracker on your car.
Is it legal to track my spouse's car?
Tracking another adult without their consent is illegal in many states, even a spouse, and co-owning the car doesn't always change that. Get their clear consent, and check your state's law or ask a lawyer if you're unsure.
Comparing more options? See our roundup of the best hidden GPS trackers for cars in 2026.
Charge it. Place it. See it move.
Track anything you own, with or without a port. Cancel any time, and the 30-day money-back guarantee covers your first month. No contract, ever.
Pricing as of October 2026: devices $69.90; plans $12-$15/mo, or $10-$13/mo per tracker for 4+; prepaid bundles available. No contract. Review count and rating from verified on-site reviews. Some links in this post are affiliate links, and ShadowGPS may earn a commission at no extra cost to you. Legal information is general and not legal advice.
