Why do battery chargers (the type that charges AA and AAA battery’s) require 2 battery’s before actually charging them?
In: Technology
Because they’re low quality. A high quality smart charger caters to each battery individually to give it the perfect charge, and maximize its life. The funny thing is, the highest quality charger on the market only adds about $6 to the cost of these AA Eneloop NiMH batteries:
* [AmazonSmile: Panasonic K-KJ17MCA4BA Advanced Individual Cell Battery Charger Pack with 4 AA eneloop 2100 Cycle Rechargeable Batteries: PANASONIC: Electronics](https://smile.amazon.com/dp/B00JHKSMJU/)
* [HKJ Review of Charger Panasonic BQ-CC17 – lygte-info.dk](https://lygte-info.dk/review/Review%20Charger%20Panasonic%20BQ-CC17%20UK.html)
> A nice -dv/dt termination with only a small temperature increase and no trickle charge, this looks very good. […] The charger is very good at filling the batteries.
You need that charger to get the full life out of Eneloops. If you take care of them, Eneloops will last at least a decade, maybe longer. The charger also works with other NiMH batteries. If you don’t have good NiMH batteries yet, get the ones I linked to above, and make sure your battery specifications match the packaging in this photo *(there are fakes out there):
* [New battery day! 24 AA Eneloop NiMH batteries in 16 and 8 cell packs. : r/AAMasterRace](https://www.reddit.com/r/AAMasterRace/comments/bo0wtt/new_battery_day_24_aa_eneloop_nimh_batteries_in/)
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