Maybe most of the batteries used are AA and AAA so :

Maybe the best-one of them all, but as Andrew would say "Not For The Faint Of Heart":

Powerex MH-C9000 WizardOne Charger-Analyzer for 4 AA or AAA NiMH Batteries

https://www.amazon.com/gp/product/B000NLUSLM/?tag=metaefficient-20

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The next ones might be easier to use and so therefore most people might do better using any of:

First, the one that I might recommend  based on what I have read:

La Crosse Technology BC-700 Alpha Power Battery Charger

https://www.amazon.com/La-Crosse-Technology-Battery-Charger/dp/B000RSOV50/?tag=kinjadeals-20&ascsubtag=59bc0f5d50963110a3109dca2617aa6d82736708&rawdata=[t|link[p|1652950572[a|B000RSOV50[au|5856732741879800112[b|deals

Most people should instead try one of the next 3 chargers, as they might be a lot easier to use:

Panasonic K-KJ17MCA4BA Advanced Individual Cell Battery Charger Pack with 4AA eneloop 2100 Cycle Rechargeable Batteries (4 pack)

https://www.amazon.com/dp/B00JHKSMJU/?tag=thewire06-20&linkCode=xm2&ascsubtag=AgEAAAAAAAAAABjK

Panasonic K-KJ17M3A4BA Cell Battery Charger with eneloop AAA New 2100 Cycle Rechargeable Batteries, 4 Pack

https://www.amazon.com/dp/B010U57MSW/?tag=thewire06-20&linkCode=xm2&ascsubtag=AgEAAAAAAAAAABjK&th=1

Titanium Smart Fast 16 Bay Ni-MH AA/AAA Battery Charger AC 100-240V + DC Adapters MD-1600L

https://www.amazon.com/Titanium-Battery-100-240V-Adapters-MD-1600L/dp/B005UNPM3M/ref=sr_1_11?s=electronics&ie=UTF8&tag=slrlounge01-20

The chargers are not that cheap, but if you use batteries a lot, in the long run it might be cheaper to:

Use rechargeable batteries

Use a charger that will make your batteries work better and maybe last longer.

As regular non rechargeable batteries can be too expensive if you have to buy them too often.

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Not all of the time and not for everything, but often the best might be that which is the best quality among those which are less expensive.

But here with these battery chargers you are not going to find that, if you want to save money on AA and or AAA batteries you might not find a good enough cheap battery charger, that is why I posted those.

Use just about any kind of rechargeable AA and or AAA Ni-MH batteries with ANY of those chargers.

One thing that is unique to them is that they don't have to charge batteries in pairs, you can charge 1 or 3 batteries if you want to.