Energizer NH22BP ACCU 9-Volt Rechargeable Battery
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Product Reviews of Energizer NH22BP ACCU 9-Volt Rechargeable Battery
Product Review: No good for my needs
Summary: 1 Stars
I'm a strong supporter of rechargeable batteries, but at 7.2 Volts, this just doesn't meet my needs. Devices that use batteries are designed to work across a range of voltages because as the battery is used, the voltage slowly drops until the battery just runs out of juice. When the dying battery crosses a certain voltage threshold, some devices warn you of a low battery. This is a good thing, because you don't want, say, your smoke alarm to need to go onto backup battery power and not have the juice it needs. The problem here is that the devices I use seem to cross the low battery voltage threshold somewhere around 7.0 volts. That is to say, I put a fully charged battery in there and before I know it (about 1 week or 2), the low battery light comes on in my answering machine or the smoke alarm starts doing it's low battery beeping thing. Nope, this is no good. I suggest you steer clear of Energizer and go for another brand that has an 8.4 nominal voltage (or better yet 9.6 if that extra .6V isn't going to harm your device--NiMH cells go in increments of 1.2 V so as far as I know there is no way to get a 9.0 V battery).
Sure this will work in many devices, but I really don't see why Energizer opted to go for a 7.2V battery instead of 8.4V other than to save a small amount of money. That seems like a very off-brand sort of thing to do. 1 star only from me.
Product Review: Not really 9V, long charge times, short life
Summary: 3 Stars
I purchased these batteries to use in a small baby monitor that requires 9-volt batteries. Alkalines lasted a good week of the monitor being on quite often; these rechargeables last about 2 days on average. I discovered they are really only 7.2-volt batteries (hidden in the packaging) but they work with my monitor just fine. The batteries take 10 to 13 hours for a full charge which is pretty ridiculous! I guess they pay for themselves over time, and seem to be the best 9-volt rechargeable product that is out there, but it is almost a step backward from alkaline batteries.Product Review: Odd-shaped 9-Volt Battery
Summary: 1 Stars
I bought this rechargeable battery for my electric bass. I go through batteries once every two weeks, so though rechargeable would be the way to go. However, when I tried to insert the 9-Volt battery into the rear of the bass...it wouldn't fit. The battery is ever-so-slightly odd-shaped. I have no problem with standard alkaline Duracell and Panasonic 9-Volts, but not this Energizer rechargeable. I went to Radio Shack and bought one of their rechargeable 9-Volts and it fits like it should.
Please Energizer, consider using standard sizing in your manufacturing! If it wasn't so inexpensive and problematic, I would have returned my purchase.
Product Review: Rechargeable 9 volt batteries
Summary: 1 Stars
The energizer rechargeable 9 volt batteries are not worth anything - they are better than most of the other ones out there, but that's not saying much. All other batteries are o.k.(AA, AAA, C, D) - it's just the 9 volts that need to go back to engineering.Product Review: TOP NECESSARY
Summary: 5 Stars
I BOUGHT THIS RECHARGEABLE BATTERY SINCE MOST OF MY KID'S RADIO CONTROL TOYS USE THIS KIND OF BATTERY. I HAVE TESTED OTHER BRANDS, BUT THIS ONE ,UP TO NOW, HAS THE BEST PERFORMANCE. IT LAST SEVERAL HOURS OF CONTINOUS USE. IT MAKES ME SAVE SOME BUCKS, AND MY KID IS ALSO HAPPY.