Home » Saving guide - rechargeable batteries

Saving guide - rechargeable batteries

In the world of electronic gadgets that surrounds us, we can't do without batteries. Not once have I thought and approached the topic of buying rechargeable batteries. There are as many opinions available on the Internet as there are users. Personally, I am a strong supporter of using rechargeable batteries instead of traditional batteries. Each of us has an impact on the surrounding environment. Therefore, using disposable batteries is simply unprofitable and not (eco) logical.

However, if we decide to buy rechargeable batteries, the question remains: what to look for when buying them? I would like to point out that this is one of the longest tests conducted on our blog. I tested the batteries I bought for over a year. This is a sufficient period to determine if a given battery is worth recommending or not.

eneloop batteries

What to look for when buying rechargeable batteries?

The most important parameters that we must pay attention to capacity, number of charging cycles, loss of capacity, self-discharge coefficient and operating temperature range (durability in extreme weather conditions). If we follow these criteria when buying, we can be sure that we will be satisfied with our investment. The battery capacity is most often expressed in milliampere hours mAh or less often in milliwatt hours mWh. A simple rule applies - the greater battery capacity, the longer we can use our mobile devices and we will less often reach for the charger, which I will also mention later in the post. Number of charging cycles determines the lifetime of the battery used. We must remember that the capacity to store energy in our rechargeable batteries will decrease over time.

It is important that the capacity loss during the year does not fall below 80% maximum 70%. In case of self-discharge coefficient, here the relationship is inverse to the previously described parameters. The rule works in this case - the lower the ratio, the better. It is important that the capacity of the charged and unused battery is as long as possible. If we use mobile devices often, it is important to pay attention to when away from home operating temperature range. At high or low temperatures, some batteries refuse to work longer.

Battery distribution

If we know what to look for, it is good to be aware that there are different types of rechargeable batteries. Due to the chemical compounds used (NiMH (nickel metal hydride), NiZn (nickel zinc), NiCd (nickel cadmium) and Li-ion (lithium ion)) and available sizes (AAAA, AAA, AA, A , SC, C, D, F, M, N). I would venture to say that the most popular of the rechargeable batteries I have bought and tested by myself are AA or AAA NiMH (nickel metal hydride). NiMH batteries themselves are divided into LSD and nonLSD. The LSD designation indicates that the batteries have low self-discharge. The purchase of such batteries is a proverbial bull's-eye.

Before I became interested in this issue myself, I followed the basic guidelines. I did not know then about the aforementioned division of rechargeable batteries - NiMH (nickel-metal-hydride). However, I don't regret buying my rechargeable batteries and dedicated charger. As I mentioned, I have been testing the Energizer 2300 mAh batteries for over a year. Initially, the purchase of rechargeable batteries forced us to use electric brushes. Normal alkaline batteries (Duracel, Pansonic, Energizer) allowed the use of brushes at satisfactory rotation of the brush head, for a maximum of two weeks of use.

With Energizer rechargeable batteries, the brush worked effectively on average over a month on one charge. Over time, I invested in the same company rechargeable batteries for a wireless mouse, watches, or Xbox controller. Effect - Charging the battery every month applies only to the Xbox iPad. I didn't have to charge the batteries used for the watches. In the case of a wireless mouse, I was charging the battery after over half a year of use.

Which charger should I buy?

Best and safest dedicated to the equipment of the company we use, or suitable for the type of rechargeable batteries we use. In this way we will avoid destroying the links. At the beginning I used a simple charger without a display (visible in the picture on the left). However, over time, I decided to buy an Energizer Intelligent charger (visible in the photo on the right). It is a compact, compact charger that houses 4 AAA or AA batteries.

The device can operate in voltage from 100 V to 240 V. I must admit that the biggest disadvantage of the Energizer Intelligent charger is the fact that we will not charge the battery individually and we will not check the battery level. Full charging of a 2300 mAh battery lasts up to 7-8 h. Thanks to the relatively long charging process, our cells are not exposed to loss of capacity. The optimal solution is to buy a processor charger. The equipment will provide us with complete control over voltage and current in various charging phases.


The most important thing is to follow the key described. With a clear conscience I can recommend the Energizer rechargeable batteries with 2300 mAh capacity that I bought together with the dedicated Energizer Intelligent charger for home use. Remember that it makes no sense to buy cheaper incompatible devices that will do more harm than good. However, if you are e.g. a photographer and expect the optimal solution, then better focus on purchasing NiMH nonLSD batteries and a processor charger. Before using rechargeable batteries, let's check whether our home equipment can work without any problems in 1,2 V voltage or if it is necessary to use 1,5 V batteries, however.


  1. Avatar Robert 30 March 2020 / 07: 58

    Do you recommend the company's batteries from the photo?

  2. Avatar beehive mamonik.pl 31 July 2017 / 07: 38

    After the title in my life I did not expect it to be a post about rechargeable batteries 😀 By the way, you run a nice blog. I think I will stay here longer 🙂

    • Avatar [Email protected] 31 July 2017 / 13: 50

      And you see 😀 Such a trick 😉 Seriously - thank you! Make yourself comfortable :*

  3. Avatar [Email protected] 13 June 2016 / 21: 19

    Thank you and welcome to follow our blog and subsequent entries on similar topics;)

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