The AAA NIMH flat top battery with a capacity of 900 mAh is one of the most popular rechargeable batteries in the market. It's a great choice for a wide range of applications such as remote controls, wireless mice, flashlights, and other small electronic devices.

The Nickel Metal Hydride (NiMH) chemistry used in this battery provides a reliable and long-lasting performance that ensures that the device runs smoothly for a long period of time. It also has no memory effect, which means you can charge it anytime, regardless of its current charge level.

This battery is designed to be recharged up to 1000 cycles, which makes it an economical choice. It saves you money in the long run, compared to using disposable batteries. The rechargeable feature of this battery also makes it an eco-friendly option, as it reduces the amount of waste generated by disposable batteries.

The flat top terminal of the battery makes it easy to install and replace, and it's compatible with a wide range of electronic devices that use AAA batteries. The battery is also lightweight and compact, making it easy to carry around, whether you're travelling or just running errands.

When it comes to charging this battery, it's important to use a charger that's specifically designed for NiMH batteries. Using the wrong charger can damage the battery and reduce its performance. It's also important to charge the battery fully before using it for the first time and to avoid overcharging it.

In terms of storage, it's recommended to store the battery in a cool, dry place, away from direct sunlight and heat sources. This will help to extend the battery's lifespan and prevent any damage. 

Overall, the AAA NIMH flat top battery with a capacity of 900 mAh is a reliable and efficient power source for a wide range of electronic devices. Its rechargeable feature, long-lasting performance, and eco-friendly design make it a popular choice among consumers who want to save money and reduce their environmental impact.