Best Rechargeable 9V Batteries of 2025

"I chose these batteries because they were more affordable than others, and I was pleasantly surprised by how well they work! My only issue is that Amazon lacks a compatible 9V charger, so I had to find one myself. As long as you get one that charges NiMH batteries, you should be fine. They come in a box that holds all four batteries snugly, which I appreciate when they're not in use."

"Switching to rechargeable batteries a few years ago was a great decision for me. I stocked up on them for devices I frequently use and even got extras for future purchases. I charge all of my Amazon Basics batteries using an Energizer multi-battery charger, and it works flawlessly. I would definitely recommend these and will buy them again."

"I've been using rechargeable NiMH batteries for years, and some of the original ones I bought are still performing well. I'm definitely saving a lot of money in the long run. While I’ve heard that NiMH batteries don’t hold a charge like alkaline ones, I haven’t experienced that issue. Just remember, you’ll need a charger specifically for NiMH batteries."

"I had high hopes for these rechargeable 9V batteries for my TENS unit, but I was really disappointed. They only read 8.23 volts when fully charged, while a new non-rechargeable battery reads 9.4 volts. After just 15 minutes of use, the voltage dropped to 8.1 volts, barely enough for the TENS unit to work. I wouldn't purchase these again. However, since then, the seller offered me a full refund, which improved my opinion, so now I give them a 4-star rating."

"I was tired of searching for 9V alkaline batteries and their high prices. So, I decided to try a handful of these and was pleasantly surprised. They work in most devices despite their relatively lower voltage. I wouldn't use them in a smoke detector or some sensitive meters, but at $4.50 each, they’re comparable to a Duracell off the shelf. I've tried both these and the black/green LP 9V set, and I find these significantly heavier with a bit more capacity."

"As always, the purchasing and shipping experience was seamless. The delivery was handled by top-notch personnel. I successfully charged the 9V batteries, but I still need to see how long they last. That will be determined with time."

"I decided to test the performance of these batteries by completely depleting them and then recharging while measuring voltages at intervals. After just five minutes on the charger, they came back to 6.97V. Their steady performance is impressive, and they die abruptly when depleted. Compared to Duracell and Energizer batteries, they lasted longer and are a great money saver."

"I highly recommend these batteries! They are easy to use, charge quickly, and are lightweight. The built-in USB charger is incredibly convenient."

"I got these batteries to save money on smoke detector replacements. Unfortunately, after charging them, they beeped with a low battery warning immediately. I tried all of them with the same disappointing results. I measured one right after charging, and it only showed 9.1 volts for a second before dropping to 0.1 volts. I would advise against this product."

"I purchased these batteries for my TENS machine and have been pleasantly surprised by their performance. I used to spend a lot on regular batteries weekly, but these rechargeable Energizer batteries have proven to be very economical."

"Finding this size of rechargeable batteries was a challenge until I discovered them on Amazon. I am thrilled to finally have access to these hard-to-find batteries."

"While I appreciate the long life of these batteries, I've noticed that the dimensions aren't quite standard. Unfortunately, I ended up with a spare battery that doesn't fit my device. However, my previous Energizer battery lasted me well over two years with around 400 charge cycles."

"I was tired of constantly replacing expensive 9V batteries, so I decided to try these BL 9 Volt Rechargeable batteries. I’m so glad I did! They provide plenty of power and last a surprisingly long time on a single charge. The included charger is compact and easy to use, and the batteries themselves are durable and well-made. I've been using them in my smoke detector and other devices, and they've performed flawlessly. These batteries are not only cost-effective, but also more environmentally friendly."

"I have experience with rechargeable batteries, and I’m pleased with these. They recharge way faster than quality NiMh batteries, and they run my two different brands of smoke detectors just fine. I’ve been using them for 8 months on the first charge without any issues. I have a large home with 10 smoke alarms, and none have beeped for low battery. Just remember, they must be charged with a Lithium Ion rechargeable battery charger!"

"I bought these to replace alkaline 9V batteries in various devices, like battery backups for our adjustable bed. One of the batteries didn’t charge, but I received a replacement pack with all good batteries. I don’t expect their life to match alkaline batteries, but I can recharge them, which helps reduce waste. Overall, I’m satisfied with these batteries, especially since Amazon replaced the faulty one."

"I appreciate the USB charging system. I use these batteries daily for my 9v pump, and I’m impressed by how long they last. The charging time is fast, and I always have a spare available."

"I bought these batteries for my acoustic electric guitar with a built-in tuner. After comparing the cost of 3 disposable batteries to just 2 rechargeable ones, I’m glad I chose these. They fit perfectly and are versatile for various uses."

"I use these batteries in my 8 smoke detectors. I recharge them every 6 months, which saves me money compared to replacing them. They hold a good charge and work great!"

"I've been using these LETOM 9V lithium USB rechargeable batteries for my ScatMat and they work perfectly. It's so easy to charge them by just plugging into a USB-C cord—no more hunting for custom chargers. Plus, they are lightweight and fit seamlessly in my devices. I've tested them and they deliver a good shock, just like traditional alkaline batteries. I'm transitioning all my 9V devices to these batteries!"

"I absolutely love how these USB-C rechargeable 9V batteries simplify my life. They charged up in about 30 minutes and the LED indicators make it easy to see when they are done. I'm using one in my fiber optic light meter and it fits perfectly. I can charge them from my power bank or even in my truck, making them incredibly convenient. I will definitely order another set soon!"

"These rechargeable 9V batteries are a game-changer for my smoke detectors. I used to worry about them chirping in the middle of the night, but now I just recharge them once a year and they last. They are easy to charge and have saved me money compared to single-use batteries. I highly recommend switching to these!"

"I purchased these batteries to cut down on the exorbitant cost of disposable ones. They seem to last longer than disposables, and they're better for the environment too!"

"So far, I've only used one battery, but I'm pleased with its performance in my LED block light with either 2 or 6 LEDs. Satisfaction guaranteed!"

"This was the perfect replacement battery I needed for my headphone amplifier. It works just as expected!"

“I really appreciate that I can charge these batteries using a simple USB-C cable instead of searching for a special charger. They've been working well since May 2024, and I highly recommend them.”

“I was surprised to find rechargeable 9V batteries; these are fantastic! They don't need a proprietary charger, just a cable. I've switched all my non-rechargeables at home to these, and the price was great with fast shipping.”

“These batteries are solid, but I found out they need more than 9V to fully charge. A standard cellphone charger won't do the trick; you'll need a laptop charging block for that.”

"I bought this for my old digital clock radio. The disposable batteries don't last long, so I decided to try this. Now, I can simply charge it when it runs out and put it back on the clock. I'm saving money on disposable batteries. Charging is also quick. Very convenient and effective. Highly recommend!"

"After getting a small practice amp for my guitar that runs on a 9V battery, I quickly realized the regular batteries wouldn't last. I found a power supply that worked, but for outdoor use, I needed a rechargeable solution. I came across this battery and charger. To my surprise, it charged quickly and worked well, even though the lifespan isn't very long. The convenience of not having to toss batteries is a huge plus!"

"I love the idea of rechargeable batteries, but I had two minor issues. While it charged quickly, I never saw the green light indicating it was fully charged. Also, there was a slight static hum when I used it in my audio device. I think it may perform better in non-audio applications."