Amazon Basics 8-Pack Rechargeable AAA NiMH High-Capacity Batteries, 850 mAh, 1.2V, Recharge up to 500x Times, Pre-Charged

Key Features

• IN THE BOX: 8-pack AAA rechargeable high-capacity batteries; 850 mAh
• DEVICE COMPATIBILITY: Ideal battery for a wide range of high- and low-drain devices
• RECHARGEABLE: Delivered pre-charged and ready to use; can be recharged up to 500 times with minimal power loss
• LOW SELF DISCHARGE: Maintains 80% capacity for 24 months
• EASY USE & STORAGE: Ships in Certified Frustration-Free Packaging
• NOTE: Same product, new look; appearance of batteries received may vary
• NOTE: To avoid damage or undesired rapid discharge of the batteries, DO NOT MIX: non-rechargeable with rechargeable batteries; fully-charged with mid- to low-charged batteries; new with old batteries; different mAh capacities; different brands
• Ni-MH Battery Tips: Verify device compatibility with 1.2V Ni-MH batteries. Runtime may be shorter than 1.5V alkaline batteries. Check proper fit as Ni-MH batteries are slightly larger than alkaline batteries to comply with IEC standards. Replace all batteries simultaneously and consult the device manual for specific requirements.
• Charger Tips: Use only Ni-MH specific chargers with independent charging channels and voltage monitoring to prevent overcharging or undercharging. Avoid timer-only chargers and never use chargers designed for other battery types (like NiZn or Li-ion), as this may cause damage or leakage.

About This Product

Amazon Basics 8-Pack AAA High-Capacity 850 mAh Rechargeable Batteries, Pre-Charged, Recharge up to 500x Amazon Basics

Product Details

Brand

Amazon Basics

Model

HR-4UTHA-AMZN (8P)

Dimensions

0.4 x 0.4 x 1.74 inches

Weight

12.2 g

Manufacturer

Amazon, this product may originate from China or Malaysia

Date First Available

July 1, 2019

ASIN

B00HZV9YE0

Customer Reviews Summary

Amazon Basics AAA Rechargeable Batteries (850 mAh, NiMH) — Tested Capacity, Performance & Matching ResultsI tested a full 12-pack of these AAA rechargeable NiMH batteries after a couple months of normal use in kids toys and various gadgets using a charge/discharge/charge analysis cycle, and the results were consistently strong, well above the rated capacity, with only one weaker outlier.Test Setup* ISDT N8 Series smart battery charger* Full analysis cycle (charge → discharge → recharge)* 0.3A charge/discharge rate* 0.90V cutoff voltage* Temperature range: 28°C – 33°CMeasured Results* Average Capacity: 1,079 mAh* Highest: 1,171 mAh* Lowest: 964 mAhAll cells exceeded the rated 850 mAh capacity, with most landing comfortably above 1,100 mAh, which is excellent performance for AAA NiMH batteries in this price range.Internal Resistance & Performance* Average: 193 mΩ* Most cells: 180–200 mΩ* One outlier: higher resistance, lowest capacityLower internal resistance helps with performance meaning less voltage sag in high-drain devices like controllers, camera accessories, and other electronics.Cell Matching Results:After testing, I grouped the batteries by performance:* Top tier (7 cells): high capacity, closely matched* Mid tier (4 cells): slightly lower capacity but still good* 1 outlier: lower capacity and higher resistanceThis is typical for budget rechargeable batteries but still allows for multiple well-matched sets.What Stands Out* Consistently exceeds rated capacity* Good overall cell matching* Only one weak cell in the pack* Works well for both high-drain and everyday devicesFinal ThoughtsThese Amazon Basics AAA rechargeable batteries are a solid high-capacity option at a very reasonable price. With basic matching and rotation, they can deliver performance close to more expensive brands.The cons to this being that this is effort you generally don’t have to expend with more expensive premium Japanese made cells. However, if the cost savings are worth it to you these are a great value for the money and outperform a lot of the other Chinese-made budget cells. Some of whom wildly overstate their actual capacity.Rating: 4.5 / 5 (Can’t give half a star Amazon rating. Hence the five star rating)Please note: All NiMH rechargeable batteries have a break-in period when new. This is usually 3-5 full charge/discharge cycles (premium low self discharge Japanese-made cells generally only need one or two cycles). A good smart charger with a “refresh” or “activation” function can do this for you (it can take several hours) or it will naturally happen over time as you use them. This just means that capacity will increase after break-in so rechargeable batteries aren’t necessarily defective if they don’t meet their rated capacity straight out of the package.Why grouping similar performing batteries, if possible, makes a difference in real-world performance. When using rechargeable batteries in devices that use multiple batteries like controllers the load is shared by both batteries. Pairing a strong cell with a higher capacity and lower resistance with a weaker lower capacity higher resistance cell means the weaker cell is going to deplete and drop voltage faster. The stronger cell ends up shouldering more of the workload. This all means you get less time between recharges. None of this, of course, is strictly necessary, but if possible analyzing and grouping together similar performing batteries will increase their lifespans and give you more usage time between recharges. Once again not strictly necessary but something to note.