Blackout? A primer on rechargeable batteries

A good stash of batteries is a preparedness essential. From the standard AA to larger 12V batteries, this article takes a look at the different types of rechargeable batteries out there and what you need to know about them.

Battery banks can help get you through some major storms by providing enough power to keep you a little more comfortable and entertained.

Rechargeable Basics

In our household, we have made an effort to buy devices that take the same types of batteries whenever possible. AA or AAA are the most common batteries for devices overall, so that is what we have gone with over the years.

Obviously, for devices like smoke detectors 9-volt batteries common. While you can get rechargeables, smoke detector batteries last long enough that it doesn’t seem worth it to us. It doesn’t seem like many things beyond that take a 9V.

Larger flashlights and some kid’s toys sometimes take C batteries. We keep a few C’s around for this purpose.

Rechargeable Batteries Vary in Capacity

Not all AAs are equal. While a 1.5V AA battery has a limit to how much power it can hold, what you get when you buy rechargeables vary quite a bit. Generally speaking, the batteries that hold a greater charge will cost slightly more, but in my opinion, they are worth it. More power means fewer changes and more time between charges. This is particularly helpful when you are using rechargeables in high-drain devices or devices that get used frequently.

Rechargeable Brands

Amazon Generic Batteries

These batteries are ok for general use, but I have to say that they do not hold a charge for as long as I would like for some things. This means if you have a bunch of charged-up batteries stored, you are probably going to have to partially recharge them within a month or two. That has just been our experience. It can be hard to remember to cycle batteries through. Of course, keeping them topped off by recharging takes some energy. If you are just letting batteries sit and then topping them off a lot, you may be wasting quite a bit of power. If you are using a solar charge, this may not be that big of a deal, but if you are paying for power from a company, you may want to consider how many batteries you are keeping topped off. Remember that all batteries are only good for so many cycles; after that, their ability to hold a charge is going to be reduced.


This company used to be known as N-Energy. My husband and I have used the Tenergy rechargeables for many years. They are the best we have found for holding an extended charge. On Amazon, you can get starter packs with a charger and a wide selection of batteries for a good price. If you need to add packs of batteries at any time, they always seem to be available, and the price is still good even if you are just getting a 2-pack of C’s or an 8-pack of AA.

Solar 12V Batteries

My husband and I have used solar power in our home for years. We have gone through a few lead-acid batteries in our time. There have also been times when we were very busy and did not take care of them as well as we should, so they had to be replaced sooner.

It seems that lead-acid has a lower cost upfront, but they don’t save much over the years compared to lithium. Now that major retailers online are selling lithium 12V batteries, it is much easier to get them. In the past, it was just easier to pop on down to Autozone and pick up a few marine or golf cart batteries, especially when you added in the discounts that are typically available.

Now that seems like a lot of heavy lifting and hassle. At the time of writing, we have two 200 amp-hour lithium 12V batteries on the way.

Lithium Pros

  • Lithium batteries weigh less than lead-acid batteries. Lithium batteries are around 50% lighter, so they are easier to move around and cost less to ship.
  • No need to top off water or perform other maintenance
  • Long life
Lithium Cons
  • Higher cost
  • More flammable and dangerous if they do catch on fire or explode
  • Usually have to be ordered and shipped
Lead Acid Pros
  • Lower cost
  • Available at any auto parts store or big box store with an auto section
Lead Acid Cons
  • Often require maintenance. Water levels need to be monitored.
  • Very heavy
Ampere Time

These are typically sold in 100-amp hour and 200-amp hour sizes. Something I learned about lithium batteries and solar is that you want to buy all the batteries for your system within six months for best results. Having a lot of batteries that vary in age is not efficient.

The Ampere Time 200-amp hour version weighs about what a standard lead-acid battery does that holds half the charge. The listed weight for this version is just over 47 lbs.

Note: I encourage you to check the price on eBay and Amazon before ordering this brand. We saved about $100 on two batteries by ordering direct from Ampere Time on eBay.

Solar Battery Charging

For prepping purposes, I recommend having some type of setup for charging batteries via solar power. Here are a few options with varying costs.

Power Center

Even the most diminutive Jackery Power Center with a 50-watt portable solar panel can provide a lot of power to run to charge batteries. Using a power center system allows for a lot of versatility when it comes to backup power. You can just use the plug-in or USB chargers that come with your rechargables.

[caption id=“attachment_508920” align=“aligncenter” width=“754”] The Jackery Explorer 240 is an affordable small power center with an excellent reputation.[/caption]

C Crane
These devices use a small solar panel to charge some AA or AAA batteries. They can often be charged using USB if solar is not convenient.

[caption id=“attachment_508922” align=“aligncenter” width=“639”] The C Crane battery charger can charge any size of battery via the built-in solar panel.[/caption]

Foldable Solar Panels

A lot of portable solar panels have USB ports that, when combined with the right USB cable, allow you to directly charge devices as long as the solar panel has adequate sunlight. Jackery makes some high-quality portable panels, but they are somewhat expensive. There are plenty of smaller portable panels available on Amazon or eBay that have USB charging capability. Some of the portable panels are made to be worn on a backpack so you can charge batteries or devices as you like.

Using the USB charging option also means you can hook up almost any USB-powered battery charger.


How many rechargeable batteries do you need

It may take a little time to survey all of your battery-operated devices, but you should add up how many of each type you need to run. Now, take that number and add 25% to it. I throw that percentage out there because it is unrealistic to expect anyone to remember to recharge a set of batteries right away every single time they are depleted. Then you need to consider that you may buy something else that takes a common battery type.

Even then, it still might be a good idea to buy a few rechargeables every time you add a few battery-using devices to your home.

Traditional Batteries

I fully support having some non-rechargeable batteries on hand. There are some devices you do not want rechargeables for. An example of this is an emergency flashlight you keep in your car. The last thing you want to happen is to find out the rechargeable you left in your flashlight have discharged over time, and you have a useless flashlight.

Duracell Optimum

These batteries are not cheap, but they have a big charge that stays good for a long time. I recommend having a few packs of Duracell Optimum on hand. These are an excellent choice for smoke detectors too

Battery Maintenance and Storage

Storing batteries should be taken seriously. Non-rechargeable batteries are prone to corrosion if stored poorly. Rechargeables seem to be a bit less prone, in my opinion.

I recommend having a battery box or two that encourages proper storage. Battery organizer come in all shapes and sizes. The plastic case below have appropriately sized slots to store a variety of batteries. A clear lid makes it easy to see what you have on hand.

[caption id=“attachment_508924” align=“aligncenter” width=“716”] This battery organizer is a great example of a battery box for storing your stash. I like that it accommodates all sizes of batteries.[/caption]

Large batteries such as those used for solar arrays or cars, trucks, and other machines, should be stored in a battery box if not being used in a vehicle or machine.

[caption id=“attachment_508925” align=“aligncenter” width=“545”] A good battery container encloses your battery in a vented box. Your battery is protected from impacts and accidental shorting. If battery acid leaks or spills, the box will collect it so it doesn’t run everywhere.[/caption]

There are some really neat battery boxes out there. Some have small inverters and charge controllers, so basically, all you have to do if you want a portable power center is drop a battery in the box and maybe by an inverter that fits into a standard 12V outlet, so you have input options such as a 110V plug or USB. You can also get plug-ins that split the single 12V power outlet into 2-4 outlets. Keep in mind the amount of power you can draw at one remains the same.

[caption id=“attachment_508927” align=“aligncenter” width=“845”] The Newport Vessels battery box offers storage and the convenience of a small portable power center. Just add a battery that is Group 24 or 27 size.[/caption]

Battery Disposal

If you have automotive or marine batteries, you can save them and then return them to the store the next time you need a battery. The auto shop will recycle the battery for you and give you some money for the core. This reduces the cost of future battery purchases.

Common household batteries can be recycled in most areas. If you find that you want to just dispose of a larger battery, you may need to contact your waste service or check out the garbage service website in your area.


It is essential to have a good battery system for your household. During emergencies, batteries can keep things going and add to your comfort or even your chances of survival.

You should assess how many batteries you need to power all your devices and allow for a few extra. Most devices that use conventional batteries use AA or AAA, but lithium is becoming more common than it once was.

Storing batteries properly reduces the risk of corrosion. If you are not going to use a device for a few months or longer, you should consider removing the batteries to eliminate the risk of battery corrosion and a ruined device.

Remember to occasionally replace rechargeable batteries. While they say that they are good for so many charging cycles, that doesn’t mean they will hold a charge as well towards the end of their life. If a battery stops holding a decent charge, then it is time to toss it.

This is a companion discussion topic for the original entry at

Long Lives Compared

I just bought some non-rechargeable Energizer AA 1.5V lithium cells expiring in 2041, far beyond my own expiration date. Made me think a little.


Important Article

This is an important article. I already had back up batteries and the like.
But don’t forget about candles. They are easy to store, last a long, long time and provide a light which is soothing in a time of crisis.


Turn Aa Cells Into C Or D Cells

These work
Check this out on eBay!
Battery Buddy AA to C/D ADAPTER


Rechargeables In Garden Water Control Timers

I purchased a Powerex charger for AA and AAA batteries so I could have a bit more redundancy for my garden timers. The charger works fine but the batteries themselves were not reliable in the timers.
Further checking revealed that the Rainbird timers recommend NOT using rechargeables apparently due to the lower charge level. I have not tried the Tenergy battery.
For the moment I am using Duracell as I really don’t want to risk losing a crop to a failed timer battery.
Meanwhile, my gophers always seem to have a full charge!


Also oil lamps, lamp oil and wicks.



Teenagers may be the best teachers of the utility of reliance on batteries. I have lost count of the number of “rechargeable” units that have gone to recycling (or the dump). In my days living off grid with solar/battery systems, there are a host of mistakes possible, and maintenance is a thing.


Nimh Batteries

Something that I have found out about Rechargeable Batteries is worth mentioning. It has to do with Nickel-Metal-Hydride (NiMH) batteries and how they handle a highly inductive load.
I had a Rain Bird automatic timer for the Garden Hose for scheduling the irrigation. Once the original Alkaline Cells needed replacement I charged up two NiMH cells ( AA size ) and put them in.
The next time the unit tried to open the water valve, it did so, but did not shut off after the watering period so I went to find out why.
The battery compartment was steaming vapor, the plastic had fused shut, and the whole thing was screaming hot. I pried the battery compartment out with a hammer and chisel and managed to separate the batteries from the unit itself.
The circuitry had self-destructed, as well as having the two nearly-melted NiMH cells. The issue as I have come to find out is that NiMH cells do NOT want to handle the high instantaneous current pulse necessary to open or close a solenoid.
I expect the same precaution relates to other devices as well, such as Relays, Motors, and Solenoids – anything which drives a strong current through an inductive load.
– Chuck


I’m Over Duracells…

I never remember it being a thing in the past, but I now consider Duracell batteries to be destructive to all things to which they are installed. I can’t tell you how many things- expensive test meters, various recorders and radios, household devices, flashlights- I’ve had to toss due to battery leakage. Who really has the time to monitor all those gizmos constantly for battery condition? I’ve even had brand new packs of Duracells- “ten year shelf life”- leak when in storage a couple years. Sheesh…As a stop-gap, I’m leaning towards removing batteries from everything I don’t use almost daily. Kind of a hassle…I’m considering transitioning more towards devices that use the 18650 style lithium battery. This is probably the type battery that is in your little USB charge pack, cordless drill, or nose-hair trimmer ?. They tend to hold a charge for a long, long time. They do require a more involved charging process and charger, but I’ve never had one leak, and they are generally higher capacity than any other rechargeable. 3.7v, so more in keeping with the ubiquitous “5v USB” that powers so many devices these days. I got this amazing Hybridlight 300 a couple years ago at Costco that came with an equally amazing little “camp light”- the model PUC. I’m guessing- because surprisingly I haven’t taken them apart yet- they have the 18650 battery in them because they offer USB charging, in and out. I’m exploring this battery more, as I have access to some “failed” battery packs from power tools, lawnmowers, etc. The batteries are mostly good- the internal pack circuitry usually fails. But this is a kind of DIY project that’s not for everyone…Aloha, Steve…


Regarding leaking alkaline cells … you are absolutely right.
They have resulted in countless ruined devices.
I did find something that is useful to attempt DIY repair on them, in some cases at least.
Lee Spring Company has some battery contacts that are made for AA and AAA cells. There are several alternative choices. Here is what I bought.
The springs are made from Beryllium Copper, and silver-plated so they can easily be soldered - which is not possible with steel springs.
If you have a drawer full of dead remotes, calculators, and flashlights, it’s worth your thinking about.
– Chuck


Yes on the 18650 batteries. Very powerful generally, very few failures for me over a decade. Can be used to refurb portable tool packs if you are skilled.


You had me all excited for a moment there, Chuck. But $9 each in small qtys? I’d be likely to try this first. Undoubtedly not the quality of Lees, but…Aloha, Steve

Batteries With Direct Usb Charge

This brand of battery has a mini usb charger right in each battery

A friend of mine runs a Bed-and-Breakfast, and each room has a battery-operated Safe for valuables, and an A/C remote.
I justify what is [admittedly] an exorbitant expense by the fact that in many cases I can turn that $9.00 and a few minutes of soldering into a case of beer.
Just saying …
– Chuck

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There you go! Just shows how a person with skills will prosper in the coming times. Good on ya, Chuck! Aloha, Steve


12v Battery Cycle Life

You failed to mention the battery life comparison for lithium and lead-acid
Lithium batteries last much longer (more charge - discharge cycles)
So you can buy cheap lead acid batteries and replace them every 5 years, or buy expensive lithium batteries and replace them every 15 years.

My Thoughts

The 12volt solar off grid batteries - Lithium has only pros and very few cons compared to lead acid.
LiFePo4 lithium batteries are very safe, they are not in normal use a fire risk.
For example they do not catch fire on over charging. The only way you will get a LiFePo4 battery to ignite is to puncture the battery cells with something like a nail or to set it on fire by other means.
As we enter an age of scarcity, the fact that you can use 90-100% of that advertised 200ah capacity in a lithium battery and get 2000-4000cycles out of the battery with still life in it, is the main selling point.
The cheap FLA or SLA batteries allow 40-50% of the capacity to be used and are generally knackered by 500 cycles, if not before.
The only thing going for lead acid batteries these days, is the cost and that is not a reason to purchase them. Also I have seen a fire started by an exploding lead acid battery in a battery bank.
Jackery make very good all in one powerpacks (solar generators) and it’s great that you meantion them, as these kind of power supplies offer a great way of having some back up 120v energy without the need for a generator.
I prefer Poweroak, which are branded Bluetti in the US, they use LiFePo4 cells and have a longer overall life. Also judging by the Amazon reviews of both companies products, Bluetti seems to have a lower failure rate.
The main problem I see at the moment (seems to be more of an issue in the US, than Europe at the moment) is getting hold of a Jackery or Bluetti solar power generator!


Standard NiMH rechargable batteries have a 1.2voltage instead of the 1.5v that you get with a non rechargable Duracell AA battery. There are some lithium rechargeable AA batteries available that would give you 1.5v and a long standby life - they are recharged using a usb lead.

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Those dates are sketchy. Pulled same Energizer Lithiums out of their original packaging for use with years to go on them and they barely lasted 2 months in a 2 year estimated use for the device they were in. Just an FYI.


Battery Life

I have noticed that batteries last way way longer when you remove them from the device, when you are not using it.