9V rechargeables?

[tinpanalley]

For obvious reasons (AAA and AA being much more prevalent in people's homes) I don't see a lot of 9V chargers online, or at least not the same market for them. Is there a brand or type to look out for? I know with AAA and AA it's very important to get the right kind that doesn't weaken batteries, how they charge, how they stop charging when they're full, etc.
Any things to look out for? For all I know, recharging 9V isn't even worth it?

 

[shortylickens]

I guess it depends on how many 9 volt gadgets you have in the house.

But yeah, you can recharge them. I have a multicharger that allows you to do just 9 volts if theres nothing else.

https://www.amazon.com/EBL-Battery-...TF8&qid=1515315670&sr=8-5&keywords=9v+charger

Kinda like this.

Actually this is the one:

https://www.amazon.com/Tenergy-T-11...id=1515315723&sr=1-13&keywords=C+D+9v+charger

 

[tinpanalley]

But yeah, you can recharge them. I have a multicharger that allows you to do just 9 volts if theres nothing else...

Ok cool. Thanks for the recommendation. I was hoping there was something more like this which I have for my AA and AAA. The amount of repairs I've done to batteries I thought were dead with this thing is incredible. Such useful information while charging.

 

[mindless1]

For obvious reasons (AAA and AA being much more prevalent in people's homes) I don't see a lot of 9V chargers online, or at least not the same market for them. Is there a brand or type to look out for? I know with AAA and AA it's very important to get the right kind that doesn't weaken batteries, how they charge, how they stop charging when they're full, etc.
Any things to look out for? For all I know, recharging 9V isn't even worth it?

Personally I would avoid the EBL brand, they make a lot of junk that cooks batteries.

Worth depends on situation. Is your 9V powered gear valuable or might it be as cost effective to replace with more modern gear using another cell type? 9V rechargeables tend to be expensive for their capacity, be low capacity, and be lower voltage.

Devices that use them often have a very low current draw so we're talking years of service from an alkaline that costs a fraction as much. How many years do you anticipate continuing to use the 9V powered gear to make the investment worthwhile?

Here I only have a few mains powered smoke detectors with a 9V backup battery. They came with a duracell alkaline and I'll replace that once with a new alkaline before the whole detector is replaced from old age. Buying batteries and charger that cost as much as the detectors do, wouldn't make sense.

I think I have an antique calculator and children's hand held game that take 9V. They haven't been used, haven't even seen them in years and will throw them away when I next do.

 

[Red Squirrel]

Keep in mind because of the chemistry, they are actually like 7.2ish volts, which may not be enough for some things. might be closer to 8 when new. The only ones I've seen are ni-mh which are about 1.2v per cell so they will use 6 cells. Not sure why they don't use 7 or 8 cells. Or maybe some of them do.

I have seen primary cell lithium 9 volts and they tend to last longer. Typically used in smoke detectors.

 

[tinpanalley]

Worth depends on situation. Is your 9V powered gear valuable or might it be as cost effective to replace with more modern gear using another cell type? 9V rechargeables tend to be expensive for their capacity, be low capacity, and be lower voltage.

Worth also depends on personal opinion. In our home we do everything possible to be as zero waste as possible. To me, a slightly more expensive battery that doesn't get thrown out where you'd throw out even one other battery in the same time is worth it. The two devices are very high quality prosumer food and body temperature thermometers and professional grade wall stud, electricity and water pipe finders. They don't get used often enough to drain quickly. So I wanted to know about rechargeables. Just want something that can charge even just one at a time and what brands are worth looking into because I come across the EBLs a lot and don't know them at all.

 

[bigi]

Got 2x9V battery+charger combo from eBai, works well.

 

[mindless1]

Worth also depends on personal opinion. In our home we do everything possible to be as zero waste as possible. To me, a slightly more expensive battery that doesn't get thrown out where you'd throw out even one other battery in the same time is worth it. The two devices are very high quality prosumer food and body temperature thermometers and professional grade wall stud, electricity and water pipe finders. They don't get used often enough to drain quickly. So I wanted to know about rechargeables. Just want something that can charge even just one at a time and what brands are worth looking into because I come across the EBLs a lot and don't know them at all.

Sure, I don't aim for zero waste because there's no such thing but low waste is good. However, they're not "slightly" more expensive. They're multiple times more expensive before you count the charger. Amazonbasics 9V are currently around $10 an 8-pk and get good reviews.

EBL are junk, at least get a decent brand. Since I don't use 9V rechargeables I can only advise going by reviews for other brands, but other EBL cells and chargers I have had experience with, they're bottom of barrel and a disappointment waiting to happen.

As far as not used often enough to drain quickly, the self discharge rate just sitting on a shelf can mean that if you don't pick low self discharge batteries, you may find them needing recharged before use which can become a PITA.

For low drain devices I don't see any savings over alkaline 9V and if concerned about environmental footprint, recycle them. AA cells on the other hand, I stopped buying alkalines years ago and only use the ones that come free with device remote controls because it'd be a waste if I didn't.

 

[tinpanalley]

Sure, I don't aim for zero waste because there's no such thing but low waste is good.

It's just a way of saying we keep our waste to the minimum we can reasonably do. Hence, "zero waste as possible". I could have been more precise with my language, I suppose.
Ok, fair points. I believe, my wife and I operate this way anyway, that our responsibility is to simply always ask, is there a way to do this that leaves less of a footprint. By the way, I'm sure you're aware but not all recycling systems work the same in every place. Some recycling is flat out inadequately done. We do have to start asking a bit exactly what is happening when our cities, towns, etc say they're recycling and what facilities things are going to. Anyway, a topic for a completely different place. Bottom line is, fair points, good things to think about, and thank you. I do find it interesting though, just as a sidenote, that on Amazon 980 out of 1200 people have given EBL 9Vs positive reviews. I know they're not exactly Newegg or B&H customers but still, that's a good indication that most people seem happy with them. Again, just a sidenote observation, not to discredit your opinion.

 

[Red Squirrel]

I wonder if they make lithium ion rechargeable 9 volt batteries. That would be your best bet. ni-mh has too fast of a self discharge rate, so it's not ideal for tools you don't use often. I did the same thing, I got rechargeables for stuff like my stud finder, which I don't use that often. Every time I go to use it I need to charge the battery.

 

[mindless1]

I do find it interesting though, just as a sidenote, that on Amazon 980 out of 1200 people have given EBL 9Vs positive reviews. I know they're not exactly Newegg or B&H customers but still, that's a good indication that most people seem happy with them. Again, just a sidenote observation, not to discredit your opinion.

Might be a red herring. There are people who give their dumb chargers that cook batteries a good rating too, and their AAA and AA regular NiMH (non-low-self-discharge) which are about the worst tier 3 branded cells you can get. Then again if low self discharge NiMH or Li-Ion based (then needing a special charger) you're just spending multiple times as much that you might never recoup on the viable lifespan of most slow drain devices.

I wonder if they make lithium ion rechargeable 9 volt batteries.

There are some including some from EBL, $10 a 2 pack... plus cost of charger for them, or $22-$24 charger included for a 4 pack. Better performance than NiMH but for a small # of devices, the cost per device rises even more due to needing a charger.

https://www.amazon.com/EBL-Rechargeable-9V-Batteries-Lithium-ion/dp/B00EJ4NJ7E
https://www.amazon.com/gp/product/B00HV4KFSA