What is the difference between the AmazonBasics "black" label and "white" label?

Amazon keeps switching up the game to keep us guessing. As of 7/20/2019, the black label/green top batteries are definitely made in CHINA not japan (just received some, and I'm sending them back). None of Amazon's descriptions state whether or not either the black, silver, or white batteries are made, so I would assume that they are all Chinese at this point, which implies all of the manufacturing, quality, and supply chain issues Chinese batteries are famous for at this point. Do yourself a favor and spend a few extra dollars for eneloop or energizer, etc.

will it be hot if charge it at 1a with eastshine s2 charger?

1a would be .5 C with these 2000mah cells.. I checked the IR of these cells and with my Turbo Matched 30 from Competition Electronics (these are a 1500 dollar cell matching system that we professional RC on road and off road car and truck guys used to match cells. Very important and HIGH TECH for the time system. Was made for Nicd cells but worked equally well on Nimh cells when they came out) and matched them to get well matched pairs for practice cells for Mod Mini Z cars and boats.. I used Enloop cells for race days and practice with these.. these cells give a solid 2050 to 2100mah handle, will give me long run times and with cells matched with a 6 amp discharge will give me a avg voltage of about 1.02v per cell over 25 minutes, my well massaged Eneloop 2kMah cells i match at 8.5 amps they give me a avg May of 1980 to 2020mah and will hold a avg Voltage of 1.06V per cell at 8.5 amp load over 25 minutes. Point is these cells are a very good value, even in high load usage these cells stand up a lot better then similarly priced Nimhs from other brands.. these cells offer 85% the performance of Eneloop at less then half the cost.. the cells hold up well until about 200 cycles then they deff start to have noticablly lower avg voltage over time at the same discharge curve.. but that's in higher load apps then most people will be using them for.. I charge these cells at .75C or 1.5 amps, at 1.5 amps the cells are slightly warm off the charger and that's how I want them, slightly warm when ready to run as the IR will be lower with a warm cell over a room temp one giving me less voltage sag as the cell warms up under load... These cells will be slightly above ambient temp of charged at .5C or 1 amp, the warmth will start to happen once the cell reaches about 90^% full charge and progressively get warmer until peak charge.. at .75C charge or 1.5 amps you will notice the cells are a fair bit warmer then ambient temp and this has it's use for high load apps like my Mini Z's and some times I'll even charge them at 1C or 2 amps.. that will make for a fairly hot pack BUT will give me the highest voltage under load for the first 25 to 30% of the charge... but will ABSOLUTELY shorten the cells life and I would not recommend doing that UNLESS you know what you are doing to the cell and understand the cells life will be cut by good bit.. meaning if I get 200 really good cycles on a set of cells when charging them at .75C or 1.5 amps, moving to a 1C or 2 amp charge will know it's really good cycles life down to 100 to 125... but you will have less voltage sag/higher voltage under load taking the very warm cells off the charger and straight to using them then if you was to charge them at a lower rate and have cooler cells... Charge at 1 amp and you will be happy with these cells .5C and under will give you the longest cell life for sure..

What is the difference between these white batteries, versus the standard black ones?

Yeah not sure if color indicates anything anymore as I think Amazon just keeps changing it up. I have a set of AA batteries that are mostly gray in color with a touch of green close to the positive side of the battery. The positive terminal itself is black. Those were made in Japan. Just ordered some new ones and they are mostly green in color with a touch of gray on both ends of the battery. The positive terminal on these ones are white. They're made in Malaysia.

is there a so called memory effect?

"Memory effect" is commonly used to describe the drop in capacity in NiCd cells due to shallow discharge cycles. It does not apply to NiMH cells, especially not to low-self-discharge ('Pre-Charged') NiMH cells.In real life both NiCd and NiMH cells often drop in capacity with time, but mostly due to over-charging or over-discharging, not due to 'memory effect'.

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♻️ Power up sustainably, stay charged endlessly!

POWER THAT LASTS - 800 mAh capacity fuels your devices with reliable energy all day long.
HASSLE FREE PACKAGING - Ships in certified frustration-free packaging for an effortless unboxing experience.
VERSATILE COMPATIBILITY - Perfect for cameras, remotes, toys, and all your essential gadgets.
LONG TERM CHARGE STABILITY - Maintains 80% capacity even after 2 years of storage—ready when you are.
ECO FRIENDLY RECHARGEABILITY - Recharge up to 1000 times and drastically cut down on single-use waste.

Amazon Basics 4-Pack Rechargeable AAA NiMH Batteries deliver 800 mAh of dependable power at 1.2V, designed for up to 1000 recharge cycles with minimal capacity loss. Pre-charged and low self-discharge, these batteries maintain 80% charge over 2 years, making them ideal for a wide range of devices while reducing environmental impact.

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Item Dimensions	1.69 x 1.76 x 0.42 inches
Item Weight	1.76 ounces
Unit Count	4.0 Count
Battery Cell Type	NiMH
Recommended Uses For Product	Camera
Reusability	Rechargeable
Battery Capacity	800 Milliampere Hour (mAh)
Voltage	1.2 Volts

Amazon Basics 4-Pack Rechargeable AAA NiMH Performance Batteries, 800 mAh, 1.2V, Recharge up to 1000x Times, Pre-ChargedReducing CO2

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