EBL USB Rechargeable 9V Batteries - 5400mWh Long Lasting Batteries with Micro Charging Cable - Quick Charge in 2 Hours (Pack of 4)

Been using these batteries for around 6 years now for my fishing bite alarms and they are still going strong. A very simple design where they are just plugged into a lead and an LED illuminates to showing charging state. These charge very quickly and seem to last forever. I haven't had one run out of battery on me yet but I tend to recharge these after every 5th or 6th 48 - 72 hour session. Given that I've used these for 6 years, and compare this to how many non-chargeable 9v batteries I would have gone through over that period of time, these have more than paid for themselves. They have never let me down. They're faultless. I highly recommend.

Not bad for what I need them for. My DVM measures them at 9.0V under 80maH load and 8.9 at 120mA in my case. It charges at 450mA for most of the charge cycle.They have about 4.4W power measure from a charge cycle, which is less than claimed but then again almost every battery is not as claimed because we don't charge/discharge at the optimum conditions, so this is quite good. Image shows the usb tester when the charging had almost finished.And when I took one left unused several months after the initial charging, it it still had charge.I am happy with them.

These are actually pretty goodI am behind the times but thought i would buy these to try with usb charging.Pretty impressed actually comes with 2 usb each with 2 cables that just plug straight into battery charged in no time at all even has a little light to tell you when it is charged.

The batteries do not provide sufficent voltage for the desired application - they cannot provide 9V. They're not faulty, just not suitable for all applications.Update: The seller read my review and gave me a full refund. I have therefore changed my original review rating from1* to 5*.

I liked that these are high powered enough at 5400mWh to run my metal detector for long periods. I like that a USB lead (supplied) charges them back up nicely and I like that there were 4 of them in a pack. My metal detector takes two of them at a time, so... plenty of backup battery power if the hunt for my fortune goes on longer than expected. It's not often that a pp9 battery is required in most of the electronic stuff I buy. It's normally AA, or AAA or a built in battery these days, and so, as a hobbyist/electronics project builder, it's good to have some of these spare, and to that end I'll be getting four more of these shortly from this seller.

I think either people or amazon (or both!!) get the reviews for these rechargable EBL USB "9V" "5400mWh" Lithium batteries confused with the more common Nimh batteries. There is no way these will ever be at 9V (the only way that could happen is if they are charged via the terminals rather than the USB port (assuming the terminals do not have charge protection, I have not tested this), in which case the cells would be dangerously overcharged and could catch fire, explode)!!!I have tested a set of 4 purchased in September 2022 with the following results, all charged via the supplied USB cable and discharged at 47-50mA using an Opus BT C-900 (not using this to charge them)Battery 1 Charged voltage 8.06V Capacity 429 mAh end voltage 6.88V discharge time 9H02MBattery 2 Charged voltage 8.07V Capacity 445 mAh end voltage 6.89V discharge time 9H22MBattery 3 Charged voltage 7.72V Capacity 291 mAh end voltage 6.97V discharge time 6H05MBattery 4 Charged voltage 8.07V Capacity 439 mAh end voltage 6.88V discharge time 9H14MClearly these batteries have a greater capacity than Nimh , but do not have anything like 5400mWh (being generous and taking the best of the 4 at 8.07V x 445mAh would give 3591mWh but even that assumes the voltage stayed at 8.07v during the discharge, which it obviously does not.If your device needs 9V then these are no use , but most "9V" devices are happy with 7V.

I was trying to use it for Scout32 - ESP32 powered RC 3D printed model. Immediately I've noticed that when motors (tiny N20's) are engaged at higher speeds, the ESP32 resets. So, first idea - battery issue.Connected it to my Turingy charger, went into discharge mode, tried to set 1A - forget it. Connected normal Energizer 9v battery - can handle 2A just fine (low voltage, but it works). This EBL battery just stops delivering any power if you try to drain over 0.5A, and delivers just around 4.5V at 0.5A.At 0.1A it gives 8.84V.At 0.2A it gives 6.4V.As I needed to go via voltage regulator (9V for motors, 5V for ESP32) it was failing immediately when motors engaged, as the voltage dropped below levels suitable for the voltage regulator to work.Also, pay attention to how the capacity is described - its 600mAh in reality (tested it, reaches declared capacity).

Value for money, seem to work fine, only been used for the past 3 days