Why are some duracell rechargeable batteries black and some green?

I think the black are older. I recently ordered green and got black. They do not hold their charge and I discovered after 30 days. Amazon would not take back. I will not buy rechargeable batteries from them in future.

The ion speed 1000 charger is listed with 4 aa and 2 aaa. the photo and product description seem to suggest it comes with 6 aa and 2 aaa. which is it?

There are 4 shorter slots for the AAA batteries + 4 longer slots for the longer AA batteries. You have to put multiples of 2 of the batteries in to have it charge - so 2 or 4 of the AA - same w/ the AAA (2 or 4).

If I have 1 dead battery (0%) and 1 low battery (25%) and put both in the charger at the same time, will it only make 1 fully charged, or both?

Both will be fully charged you can put one dead and one fully charged on the same circuit and the one that's dead will charge and the other one will stay charged

My wife’s vibrator runs on 16AA cells. Energizers AA’s Peter out after 7-8hrs continuous use. Will these do better?

Yes better batteries different brands

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🔋 Power up fast, last longer, and never miss a moment!

LONG LASTING POWER - Duracell NiMH batteries hold charge for up to 1 year unused, ensuring they’re ready when you are ⏳
ECO SMART INVESTMENT - Recharge batteries up to 400 times, saving money and reducing waste—because sustainability is the new luxury 🌍
LIGHTNING FAST RECHARGE - Get your AA & AAA batteries powered up in just 4 to 8 hours with 4000 mW of charging power ⚡
TRUSTED BRAND ASSURANCE - Join millions who rely on Duracell, the #1 trusted battery brand for home, work, and emergencies 🏆
UNIVERSAL COMPATIBILITY - Charge 2 or 4 NiMH batteries from any brand simultaneously—flexibility that fits your busy lifestyle 🔄

The Duracell Ion Speed 1000 Charger delivers rapid 4-8 hour charging with 4000 mW power for AA and AAA NiMH batteries. It supports charging 2 or 4 batteries from any brand simultaneously, featuring auto shut-off and LED indicators. Included are 6 AA and 2 AAA pre-charged batteries that hold charge up to 1 year and can be recharged up to 400 times, backed by Duracell’s 10-year or 400 recharge guarantee. Ideal for professionals and households seeking reliable, eco-friendly power solutions.