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.

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.

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.

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.

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 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).

I've just taken delivery of a four-pack of these this morning.Once fully charged, they are showing an open-circuit voltage of 9.1V. I have had one connected to a buck regulator providing 5V to a small USB-powered device for several hours and the under-load voltage is now 9.04V.The 4-pack came boxed with two USB-A to dual uUSB-B power cables, allowing all four to be charged from two USB sockets. The onboard LED is red while charging changing to green once full and is easy for even me, with quite severe red-green colourblindness, to read.They have a mass of 24g each, compared to a normal alkaline which is around 45g.If the listed rating of 5400mAh is accurate, then they are considerably more capacious than many more expensive ones on Amazon. I'll update the review once I've had a chance to test this.Update---------I read the description wrong initially. The listed rating is 5400 milliwatt-hours, not milliamp-hours so one needs to divide by the voltage to give the more usual units i.e., if providing nine volts, then 600mAh which is similar to an alkaline PP3.Testing with an ammeter in the circuit described above, I'm getting more like 450mAh so far but that is a very ad hoc single measurement after only a couple of charge cycles.While this isn't super, it isn't bad either and the other features are still good - weight, LED display, ease or recharging, available voltage.

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