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Dmytro_B 6.6K Views
Aug 3, 2022 6:28 PM

Energizer Recharge Basic Battery Charger, AAA and AA Batteries Charger, 2 AA Batteries Included $7.99 +FS w/Prime

$7.99

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Energizer Recharge Basic Battery Charger, Versatile Rechargeable AAA and Rechargeable AA Batteries Charger, 2 AA Batteries Included, Charges in 12 Hours [amazon.com] $7.99 +FS w/Prime
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Energizer Recharge Basic Battery Charger, Versatile Rechargeable AAA and Rechargeable AA Batteries Charger, 2 AA Batteries Included, Charges in 12 Hours [amazon.com] $7.99 +FS w/Prime

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Aug 4, 2022 2:24 PM
317 Comments
Joined Feb 2021
NoDaAug 4, 2022 2:24 PM
317 Comments

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Not a good product.

1) Serial charging. Does not charge each cell individually. Sends 2.8V through each pair of 2 1.4V batteries. If your batteries are not drained equally this will significantly overcharge one of them adding heat and causing lower capacity and much shorter life. Go for units with 4 separate bays with separate charge circuitry for each bay.

Non-serial chargers are available everywhere for as low as this price .


2) Not smart charger. Simply applies 170-200ma for 8 hours timed on AA or 80-100ma for 8 hours timed on AAA. If you have a 600mAh AAA it will overcharge it by 200ma. If you have a 2500mAh AA it will undercharge it by 900ma.

A smart charger with individual amp control can be had as low as $12 on Amazon right now. Most are in the $18-$45 range.


These both mean:
- No ability to control charge current (which should be max 1/2 capacity of the battery). E.g. 2000 mAh battery can be charged at up to 1Amp, 900 mAh battery should not be charged faster than 450mA.

- No detection of a drop in voltage towards the end of the charge cycle (delta -V / delta T). Way easy to overheat and damage.

This is a battery killer, as would be expected by a company that primarily sells batteries.

Deep techie reviews on a similar Enegerizer charger:
https://lygte-info.dk/review/Revi...%20UK.html

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Conclusion

I do not like this type of termination on chargers because it cook batteries, especially if you try to charge partial empty batteries. Having the batteries in series is usual a bad thing, but with timer termination it does not matter.

If you want to get a long life from LSD (Low self discharge) cells, do not use this charger, with older NiMH cells it is more acceptable, but still not good.
Last edited by NoDa August 4, 2022 at 07:36 AM.
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Aug 5, 2022 10:02 AM
48 Comments
Joined Mar 2018
DanielD3712Aug 5, 2022 10:02 AM
48 Comments
Regular non-LSD NiMh? Plugs right into the wall in an inconvenient manner? I would skip this. Something like an ISDT charger is more appropriate for heavy users. Li-ion with built in USB-C ports may be better for everyone else.

NiMh doesn't degrade nicely. It will randomly fail to hold a charge at all after a while especially if unused for a year. So it's a really bad idea to accumulate a stockpile of NiMh.

When possible, buy things that use 18650s and have built in charging, it is so much more convenient. If you need NiMh, use low self discharge cells if you don't expect to drain a battery fast.

Many remaining good uses of AA and AAA are in things you usually don't drain that fast, that you expect to be able to stash for a month or two and have it be ready.
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