A laptop that only works plugged in, shuts off around 30%, or won't hold a charge at all is usually the battery, but not always. The charger, the port, and the board can all fake the same symptoms. We test the whole charging path before recommending a laptop battery replacement, so your quote is for the part that's actually failing. Serving Somerset, Hunterdon, Middlesex, and Mercer counties since 2011.
These are the patterns we see most at the bench, from a simple battery replacement for laptop models we see daily to charging issues that turn out to be something else entirely.
Plugged in overnight and the percentage hasn't moved, or the charging icon just won't show up at all.
Runtime that used to last most of a workday now taps out in an hour or two, doing the exact same tasks it always did.
Runs fine on the charger, dies instantly the moment the cord comes out, even at a reported 30–40%.
Trackpad sitting raised, keyboard deck bowing, or the laptop rocking on a flat table. Stop charging it today; details below.
Heat concentrated over the battery bay, paired with a shortened runtime, usually points to aging cells.
Not sure if it's the battery or something else? That's exactly what our diagnostic sorts out before you spend anything.
No one on this list gets a battery swapped in blind.
Every laptop that comes in for a battery complaint goes through Sentinel-7, the diagnostic process built in-house here, before we recommend a replacement. We pull the real numbers: design capacity versus full charge capacity, cycle count, and how the pack behaves under an actual load, not just what the taskbar icon says. Then we check the rest of the charging system, the charger's output under load, the port itself, and the charging circuit on the board, because a bad port or a dying charger can mimic almost every symptom on this page.
If your laptop's problem is obvious, a visibly swollen case, or a battery report that's already flagged for replacement, the estimate for a laptop battery replacement is free. Visit our office and we'll quote it on the spot. If the cause isn't clear yet, a $75 laptop battery diagnostic and charging system diagnostic gets you a real answer instead of a guess, and that fee is credited toward the repair if you move forward.
If your laptop is from the last eight or nine years, its battery almost certainly isn't a pack you pop out with a latch. It's sealed inside, under a bottom panel held by a dozen or more screws (a few usually hidden under the rubber feet), connected by a short ribbon cable, and often held or lightly glued to the chassis. That's what internal laptop battery replacement means in practice, and it's most of what battery service looks like today.
The risk isn't the screws, it's that a lithium pouch cell does not forgive a slipped tool. We've repaired laptops that came in after a battery swap attempt went sideways: punctured cells, snapped ribbon connectors, stripped fasteners. Sealed battery work is careful, unhurried bench work, done one laptop at a time.
A swollen battery announces itself physically: the trackpad stops clicking or sits raised, the keyboard deck bows upward, the bottom cover bulges, or the laptop rocks on a flat table. What's happening is gas building inside aging cells, and the pressure only goes one direction.
Power the laptop off, unplug it, and stop charging it. Don't press the bulge flat, don't puncture it, don't keep using the machine until the weekend, and never put the old battery in household trash; a lithium battery in a garbage truck is how recycling-facility fires start. Bring it in; a swollen battery goes to the front of the line here, and proper disposal of the old pack is part of the job. See our computer recycling page for how we handle it.
We replace laptop batteries across every major brand we see in New Jersey. A few specifics worth knowing before you bring yours in.
HP is the battery replacement we see most often. Pavilion, Envy, Spectre, and EliteBook models built in the last several years almost all use an internal battery under the bottom cover. HP Envy laptops run a slim chassis that packs the battery tightly against the palm rest, so a swelling Envy battery shows up early as a raised trackpad. HP's own diagnostics, like a blinking charge-light pattern or HP Battery Check, often point to the battery before we even open the case; we confirm it with our own test before quoting.
The HP battery replacements we do most are the Pavilion, Envy x360 15, Spectre x360, Omen 15, and EliteBook 1040.
Don't see your HP? Call us with the model number and we'll tell you straight.
Dell splits into two patterns. Latitude, the business line, still uses a quick-release battery on many models, no disassembly required. Inspiron and XPS run sealed internal batteries; the Dell XPS 13 and 15 pack the battery around the trackpad, so a swelling XPS battery shows the same raised-trackpad symptom as HP's Envy line. We stock or source cells for both patterns.
The Dell battery replacements we do most are the Inspiron 15, XPS 13, XPS 15, Latitude 7440, and Alienware M16.
Don't see your Dell? Call us with the model number and we'll tell you straight.
ThinkPads have historically been the easiest laptops on this list to service; some models still use a bottom-panel battery held by a handful of screws, no glue involved. Newer thin ThinkPads, IdeaPads, and Yoga 2-in-1s have moved to sealed internal batteries like the rest of the industry, but the ThinkPad line's design still tends to make the job faster than most.
The Lenovo battery replacements we do most are the ThinkPad T14, ThinkPad X1 Carbon, IdeaPad 5, Yoga 7, and Legion 5.
ThinkPad & ThinkBook
IdeaPad
Yoga
Legion
Chromebook & Other
Don't see your Lenovo? Call us with the model number and we'll tell you straight.
ZenBook and ROG laptops run sealed internal batteries, and ASUS's thin gaming chassis packs the battery close to the GPU, so a battery replacement on a ROG or TUF Gaming laptop often means clearing thermal hardware just to reach it. VivoBooks are more straightforward internal swaps.
The ASUS battery replacements we do most are the ZenBook 14, VivoBook Flip 15, ROG Strix, and Chromebook Flip C302CA.
Don't see your ASUS? Call us with the model number and we'll tell you straight.
Aspire and Swift laptops use sealed internal batteries on current models. Acer Nitro and Predator gaming laptops run hotter than most, and heat is one of the fastest ways to age a lithium battery, so we see battery replacements on Nitro laptops earlier in their life than on most other gaming brands.
The Acer battery replacements we do most are the Nitro 5, Aspire, Swift, and Predator Helios 300.
Don't see your Acer? Call us with the model number and we'll tell you straight.
We replace batteries on most other Windows laptop brands too, including gaming laptops from smaller builders. If you're not sure your model is serviceable, call with the model number and we'll tell you straight, no guessing.
Call (908) 428-9558 →The part matters more than the labor.
There's a battery on marketplace sites for nearly every laptop model we work on, priced at $20 to $50. We don't install them, and we'd steer you away from installing one yourself. Capacity claims on batteries in that range are inflated, the cells are frequently lower-grade or reclaimed, and the protection circuitry, the part that keeps a lithium pack from swelling or worse, is exactly where the corners get cut. Real-world runtime on a $20 to $50 laptop battery is often closer to an hour than the four to six hours advertised. We've seen this pattern long enough to call it what it is: under $50 for a laptop battery, assume it's a problem waiting to happen.
We install OEM laptop batteries where they're available, and grade-A cells matched to the original specification, correct watt-hour rating, correct connector, a gauge chip your laptop's firmware actually reads, where OEM isn't an option. That's also why we don't order from the same marketplace most shops use for a next-day swap: we source from vendors we've vetted over years of doing this, which typically means three to five business days between your approval and the battery arriving at our bench. That extra day or two is the difference between a battery that lasts years and one that's swollen by month six. If we already stock your model, it can be faster; we'll tell you honestly either way. Our battery installation service includes testing the repair under load before your laptop leaves the shop, and every replacement laptop battery we install carries a six-month warranty.
Why we don't publish a flat number, and what you get instead.
Laptop battery replacement cost depends on your model. Battery capacity, connector type, and available sourcing vary too much between an ultrabook and a gaming laptop for a flat number to mean much, and we won't quote a price before testing. If your issue is clearly the battery, your estimate is free. If you're not sure, the $75 diagnostic finds the real cause first and is credited toward the repair. No hourly clock either way; the number you approve is the number on the invoice.
One shop on the Route 202/206 and Route 22 corridor in Somerville, convenient to Somerset, Hunterdon, Middlesex, and Mercer counties.
Our shop sits at the geographic center of Somerset County, just off Route 202/206 and Route 22, which is why customers drive in for battery service instead of shipping a laptop to a mail-in warehouse. For most people it's under twenty minutes each way.
You drop it off, we test it, you get a quote, we call when it's ready. No shipping labels. No strangers going through your files. Residential drop-off only; on-site visits are available for business clients who need them.
It depends on your laptop's model, so we don't publish a flat price. If the battery need is obvious, your estimate is free, just bring it in. If you're not sure what's wrong, a $75 diagnostic finds the real cause and is credited toward the repair. Either way, you approve a number before any work starts.
Most laptop battery replacements take three to five business days from approval to pickup. We source from vetted vendors instead of ordering the same marketplace batteries that let some shops promise a same-day swap. If we already stock your model's battery, it can be faster, and we'll tell you honestly at drop-off.
We'd steer you away from it. Batteries in that price range typically have inflated capacity claims, lower-grade cells, and weaker protection circuitry, exactly the part that matters most in a sealed lithium pack. Real-world runtime is often around an hour, not the four to six hours advertised, and a slipped tool during a DIY swap on a sealed battery risks puncturing the cell. We install grade-A or OEM batteries backed by a six-month warranty instead.
Almost certainly, and it's urgent. That's a swollen battery. Power the laptop off, stop charging it, don't press on the bulge, and bring it in. Swollen batteries get priority handling here, and we handle disposal of the old pack safely.
Yes, that's most of what battery replacement means on laptops built in the last eight or nine years. We open the bottom panel, disconnect the ribbon cable, and remove the old cell carefully. It's not a job we'd recommend doing yourself on a lithium pouch battery.
HP, Dell, Lenovo, ASUS, Acer, and most other Windows laptop brands, including gaming laptops. If you're not sure your model is serviceable, call with the model number and we'll tell you straight.
Yes, every battery we install carries a six-month warranty. If a battery we installed fails within that window, bring it back.
The diagnostic is $75, credited toward your repair if you move forward. That covers figuring out what's actually wrong when it isn't obvious. If you already know it's the battery, for example a battery report flagging replacement or a visibly swollen case, the estimate itself is free.
Our Somerville shop serves Somerset, Hunterdon, Middlesex, and Mercer counties, including Bridgewater, Raritan, Hillsborough, Bound Brook, Manville, Warren, Franklin Township, Montgomery, and Edison. Most customers are in and out of drop-off in a few minutes.
In most cases yes, on the charger, since the part typically takes three to five business days. The one exception is a swollen battery. If yours is swelling, stop using it and stop charging it immediately, regardless of how long the wait is.
75 North Bridge Street, Somerville, NJ 08876
Mon–Fri: 10am–5pm · Saturday: 9am–2pm · Sunday: Closed
Minutes off Route 202/206 and Route 22, behind Bank of America with free parking. A short walk from the Somerville train station on NJ Transit's Raritan Valley Line.
One location, drop-off only. Dave's Computers has one shop at 75 N Bridge St, Somerville NJ. We do not offer on-site or in-home service for residential customers; on-site visits are available for business clients.
Bring it to our Somerville shop. We'll test it, give you a straight answer, and quote the fix before any work begins.
📞 (908) 428-9558