EBL Rechargeable 9V Batteries 4-Pack 5400mWh USB with Micro Cable

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’m glad I ordered these. They’ll save me money and will be brilliant for my grandchildren’s toys.

This review has been a little difficult to write and award and overall rating. Initially the concerns came due to "Rechargeable 9V Batteries - 5400mWh" and, please see photos, how these batteries are labelled. They are rated as being "5400mWh" when the typical measure to apply with rechargeable batteries would change that to "mAh" as a measure. That would mean, if that was applied.... 5400mWh / 9v and that would mean 600mAh. So using a more conventional means to express these batteries capacities would be 600mAh. I have other 9v rechargeable batteries that 850mAh. When you do that conversion it then allows you a comparable means to look at these and decide if they will fit your needs. Again please see photos.... The box that they arrive in is good, with some information about the charging and the colour of lights = red for charging and green for fully charged. This colour LED can be seen at the base of each battery near to charging port. They use a std micro USB port, but the leads supplied allows you to charge two batteries from one USB A charging device, and so you are supplied with two of those leads. I have cycled the charges about five times so far using these batteries. They seem to charge reasonably fast, around two hours from flat to full. They do not get hot either when charging. Each time that I have measured the voltage from these four batteries it is always over 9v. For me that is great as I do have some devices that will show "low battery" warnings when using certain other brands that will only charge to around 8.4v. As for there use and longevity. That is a difficult one as it very much depends on what you are using them for. Two of mine are in sue in smoke detectors, so the yare very low power usage and you would expect them to work for a very long time. Two others are cycled in my Tens machine and so they are used in a very high powered device used often. They will typically last for a full days use and then need to be swapped over. That might not seem much but is absolutely the same as the best alkaline battery and very much similar to other batteries of comparable capacity. Each battery, shown in phots, has a clear plastic cover to isolate the terminals, useful when storing charged batteries. So to summarise.... I am very happy so far with the capacity and voltage from these batteries. I am happy with their quality and, yes this has been a problem with others, their length is comparable to fit precise enclosures. The only criticism, hence the drop of one star, is related to how these batteries are labelled as mWh rather than the conventional std way of doing as as mAh, remember theses are rated at 600mAh. I would very much recommend these overall. If, over time, my experience of using these on the longer terms changes I will amend my review. I do hope that this review has helped you.

Good save money

Very good quality and easy to charge. Value for the money spent.

Good

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).

One out of 4 batteries did not work . Partial refund was issued , but the disappointment & time wasted is irreversible. Our money reaches the seller fast , but refund is slow why ? How do I know the 3 that work will not fail prematurely ? I worry it could be too late to return . This incident casts a shadow on the quality . Amazon customer service agent Pardeep was amazing - promptly found a mutually satisfactory solution of partial refund . Thank you Pardeep.