How to Replace JBL Charge 3 Battery
By Robert Jones · 2021-08-03
If your trusty JBL Charge 3 isn't holding a charge like it used to, don't bin it! I'll walk you through swapping out that knackered battery and getting your speaker back to full power.
Right, listen up. If your JBL Charge 3 is starting to give up the ghost, cutting out after an hour or two, you're probably looking at a knackered battery. Don't chuck it just yet, though; these little speakers are surprisingly easy to revive if you're a bit handy. I've had a few JBLs in my workshop over the years, mostly for friends and family whose kids have thrashed them. The Charge 3 is a solid bit of kit for the money, especially considering its age. But like anything with a rechargeable battery, it's going to wear out eventually. Doesn't matter if it's a £50 speaker or a £500 one, physics is physics, eh? **Quick Verdict: A fiddly but totally doable battery swap that'll save you a new speaker.** ### Who it's for: * Anyone whose JBL Charge 3 barely holds a charge anymore. * Folks who don't mind a bit of DIY and fancy saving some cash. * Environmentally-minded types who'd rather repair than replace. * People who appreciate a good waterproof speaker but don't want to shell out for a new one. ### Who should skip it: * If you've got absolutely no patience for small screws and delicate parts. * If your Charge 3 is already properly broken – say, no sound at all, not just battery issues. * Anyone who still has warranty left (though honestly, a battery swap probably voids it anyway). * If you'd rather just buy the latest model and be done with it. ***  *How to Replace JBL Charge 3 Battery — tested in the SpeakersMag workshop.* ## Why Bother Replacing the Battery? Look, I get it. We live in a throwaway society. Speaker dies, you buy a new one. But the Charge 3 was, and still is, a decent portable speaker. It was one of the first really popular ones that genuinely handled a splash, maybe even a dunk, without packing in. Replacing the battery is not just about saving a few quid – which you absolutely will – it's about keeping a perfectly good bit of tech out of landfill. And, let's be honest, there's a certain satisfaction in fixing something yourself. I mean, a brand new Charge 5, the current equivalent, is going to set you back around £150-£170. A decent replacement battery for the Charge 3? You're looking at £15-£30 on eBay or Amazon. The maths pretty much does itself, doesn't it? ## What You'll Need Before You Start Before you dive headfirst into this, make sure you've got everything to hand. There's nothing worse than getting halfway through and realising you're missing a tiny screwdriver. Trust me, I've done it more times than I care to admit. ### The Essentials: * **New JBL Charge 3 Battery:** This is crucial, obviously. Make sure it's advertised specifically for the Charge 3. They're usually 3.7V and around 6000mAh. A quick search for "JBL Charge 3 replacement battery" on Amazon UK or eBay will get you sorted. Look for one with good reviews. Don't cheap out *too* much here; a rubbish battery will just mean you're doing this again in six months. * **Small Phillips Head Screwdriver (PH00 or PH000):** You'll need this for all the tiny screws. Precision is key. A decent electronics repair kit usually has one. * **Small Flathead Screwdriver or Pry Tool:** Essential for carefully prying open the end caps and the main housing without scratching anything up too badly. Plastic pry tools are best if you want to avoid marks. * **Tweezers:** For fiddly wires and connectors. Your fingers might be too big for some of the tight spaces. * **Small Container/Magnetic Mat:** For keeping track of all those tiny screws. They *will* disappear into the carpet otherwise. Been there, lost that. * **Optional: Heat Gun or Hair Dryer:** Sometimes the glue holding the end caps on can be a bit stubborn. A gentle bit of heat can soften it up. Be careful not to melt anything, though! * **Optional: Double-Sided Adhesive Tape:** If your original adhesive for the end caps is a bit worn, you might want some fresh stuff for reassembly. ## Safety First, Eh? Before you even think about touching a screwdriver, make sure the speaker is switched OFF. Completely off. And unplugged from any power source. You don't want to accidentally short something or, worse, get a little zap. Lithium-ion batteries can be a bit volatile if you puncture them, so be gentle and take your time. ## Step-by-Step: Getting That Battery Swapped Right, let's get stuck in. Take your time with each step. Don't force anything. If it feels stuck, re-read the instructions or check a video. There are plenty on YouTube, though sometimes the commentary is a bit, shall we say, *enthusiastic*. ### 1. Remove the End Caps This is usually the trickiest bit, mostly because of the glue. The Charge 3 has those rubbery end caps. You need to carefully pry them off. They're held on with adhesive. I usually start with a thin pry tool or a small flathead at the seam where the rubber meets the main body. * Work your way around gently. If it's really stiff, a little bit of heat from a hairdryer (a few seconds, not minutes!) can help loosen the glue. Seriously, just a *little* bit. * Once the first one is off, you'll see a plastic cover underneath. You'll need to remove both end caps to access all the screws later. ### 2. Take Out the Screws Under the End Caps With both end caps removed, you'll typically find a few small Phillips head screws on each end. These hold the inner plastic casing in place. * Unscrew all of them. Keep them safe in your little container. Mark which end they came from if you like, just in case there's a slight difference, though usually they're all the same size. ### 3. Peel Back the Speaker Grille Fabric This is a bit fiddly. The fabric grille that covers the main body of the speaker is usually glued down at the seams. You don't need to remove it completely, just peel it back enough to expose the screws underneath. * Start at the seam, usually near the charging port or the buttons. Use your pry tool to gently lift the edge. * Work slowly. You're not trying to rip it off, just unstick it enough to get access. You might need to peel back both sides or just one, depending on where the screws are located. * You should now see more small Phillips head screws running along the chassis. ### 4. Remove the Main Chassis Screws Now, with the fabric peeled back, you'll see a series of screws holding the main internal structure together. There might be quite a few of them, running along the length of the speaker. * Unscrew all these, again, keeping them safe. Don't miss any! ### 5. Carefully Open the Speaker Housing Once all the screws are out (double-check!), you should be able to carefully separate the two halves of the speaker's inner housing. This can sometimes be a bit stiff, as there might be plastic clips as well as the screws. * Use your pry tool to gently work your way around the seam. Take your time. You don't want to snap any plastic tabs. * Be mindful of any wires connecting the two halves. Don't pull them apart forcefully. ### 6. Locate and Disconnect the Battery Inside, you'll usually find the battery quite prominent, often wrapped in a black heat-shrink material. It'll have a connector plug going into the main circuit board. * **Identify the battery connector.** It's usually a small, white plastic plug with two or three wires (red and black, sometimes a white or yellow data wire). This is where the tweezers come in handy. * Gently pull the connector straight up from its socket on the circuit board. Do *not* pull on the wires themselves, as you could easily damage them. ### 7. Remove the Old Battery The old battery might be lightly glued down or sitting in a compartment. Some models have a bit of adhesive tape holding it in place. * Carefully pry it out if it's stuck. Don't bend or puncture it. ### 8. Install the New Battery This is where it all comes together again. * Place your new battery into the compartment. If there was adhesive before, you can use a small piece of double-sided tape to secure the new one, but it's not always strictly necessary as the housing often holds it snug. * **Connect the new battery.** Line up the connector plug and gently push it down into the socket on the circuit board until it's fully seated. Make sure you've got it oriented correctly; it usually only fits one way. ### 9. Test Before Reassembly (Optional, but Recommended) Before you screw everything back together, it's a good idea to do a quick test. Connect the speaker to a charger and see if the charging light comes on. Try powering it on. If it works, great! If not, double-check your battery connection. ### 10. Reassemble the Speaker Now you just reverse the steps! * Carefully close the speaker housing, making sure no wires are pinched. * Replace all the main chassis screws. Tighten them snugly, but don't overtighten; you're just screwing into plastic. * Smooth the fabric grille back down. You might need a tiny bit of glue or double-sided tape if the original adhesive isn't holding. * Replace the screws under the end caps. * Reattach the rubber end caps. You might need some fresh adhesive (like B-7000 glue or strong double-sided tape) to get them to stick properly again, especially if you used heat earlier. Give it some time to cure before handling it too much. *** ## After the Swap: What to Expect Once you've got it all back together, give that new battery a full charge. Don't be surprised if the charge indicator acts a bit funny for the first cycle or two; the speaker's internal software needs to "learn" the new battery's capacity. * **Charging:** It should charge up fully and hold that charge much longer. You'll be back to enjoying those 20-hour playback times, or pretty close to them, depending on the quality of your replacement battery. * **Waterproofing:** This is the big one. While you've been careful, you've almost certainly compromised the original waterproofing to some degree. Especially where you've pried off the end caps and peeled back the fabric. I wouldn't go dunking it in the bath or swimming pool after this. Splashes and light rain? Probably fine. But think of it as "splash resistant" rather than "waterproof" now. Unless you've gone to town with fresh, proper waterproof sealant during reassembly, don't risk it. ## Comparison: JBL Charge 3 (Refurbished) vs. New Charge 5 Let's say you've decided this DIY job isn't for you. What are your other options? You could get a refurbished Charge 3 or just splash out on a new Charge 5. Here's how they stack up, roughly: | Feature | Repaired Charge 3 (DIY Battery) | Refurbished JBL Charge 3 | New JBL Charge 5 (Current Model) | | :---------------------- | :------------------------------ | :---------------------------- | :------------------------------- | | **Cost (approx. GBP)** | £15-£30 (battery) + your time | £80-£120 | £150-£170 | | **Battery Life** | Like new (up to 20 hrs) | Good (but not guaranteed new) | Up to 20 hours | | **Sound Quality** | Original Charge 3 | Original Charge 3 | Improved drivers, clearer sound | | **Water/Dust Proofing** | Likely compromised | Original IPX7 (if good refurb) | IP67 (dustproof + waterproof) | | **Connectivity** | Bluetooth 4.1, JBL Connect | Bluetooth 4.1, JBL Connect | Bluetooth 5.1, PartyBoost | | **Portability** | Same as original | Same as original | Slightly smaller, lighter | | **Warranty** | None (DIY) | Limited (refurbisher) | Full manufacturer's warranty | | **Effort** | High DIY effort | None | None | ### My Two Penn'orth: If your Charge 3 is otherwise working perfectly, and you've got a bit of patience, the DIY battery swap is a no-brainer for value. You get to keep a perfectly good speaker going for years for minimal cost. If you're not keen on fiddling, a good refurbished Charge 3 can be a decent option, but make sure it comes from a reputable seller with a warranty. The Charge 5 is a better speaker, no doubt, but it's a significantly bigger outlay. All depends on your budget and how much you rate the Charge 3, really. ## FAQ: Your Burning Questions Answered ### Q: Can I use any 3.7V battery for the JBL Charge 3? A: No, not really. While it's 3.7V, you need one that's the right physical size to fit inside and, critically, has the correct connector. Always buy one specifically advertised for the JBL Charge 3. Getting the mAh rating close to or slightly higher than the original (usually 6000mAh) is also important for decent battery life. ### Q: Will replacing the battery affect the sound quality? A: Not at all. The battery only provides power. As long as it's a good quality battery providing stable power, the actual sound output components aren't changed. So, your speaker will sound exactly as it did when you first bought it, but for much, much longer. ### Q: How long does the whole process take? A: If you're organised and take your time, it's probably an hour to an hour and a half for someone who's reasonably handy. If it's your first time opening up a speaker like this, maybe allow a couple of hours. Rushing just leads to broken clips and stripped screws. ### Q: Is it worth it if my JBL Charge 3 has other problems? A: Probably not, no. If your Charge 3 has crackling speakers, buttons that don't work, or won't even turn on *at all* (even when plugged in), then the battery is unlikely to be the sole issue. You'd be better off looking at a replacement speaker or a professional repair, which for a Charge 3, might be uneconomical. ### Q: Where's the best place to buy a replacement battery? A: I'd recommend checking Amazon UK or eBay. Look for sellers with high ratings and good reviews specific to the battery you're buying. Be wary of ridiculously cheap batteries, as their stated capacity might be optimistic, shall we say. ## Final Word There you have it. Fixing your JBL Charge 3's ailing battery isn't rocket science. It requires a bit of patience, a few basic tools, and a decent replacement cell. You'll save a good chunk of cash compared to buying new, and you'll feel chuffed that you've given a perfectly capable speaker a new lease of life. Just remember to be careful with that waterproofing after you've sealed it back up. Don't go expecting it to survive a proper dunk, and you'll be grand. Happy listening!