Accuplus AA Ni-MH 1.2V 1800mAh Button Top Rechargeable Battery Pack of 2 for Toys and DIY

Prototyping and Engineering Tips from Robogears

• Series Stacking for 4.8V: Using this pair (2 cells) in series gives you 2.4V. To power a 5V system like an Arduino or Raspberry Pi Pico, we recommend using two pairs (4 cells) in series to achieve a nominal 4.8V. This is often close enough to 5V to run logic circuits without a regulator, though a boost/buck converter is always safer.

• Smart Charging: To get the longest life out of your Accuplus batteries, use a charger with $-\Delta V$ (negative delta voltage) detection. Overcharging Ni-MH cells can cause internal pressure buildup and venting.

• The "Alkaline Swap": While these are 1.2V and Alkalines are 1.5V, most devices work better with these under load. Alkaline batteries drop to 1.1V very quickly when a motor starts, whereas Ni-MH stays steady at 1.2V for almost the entire run.

• Maintenance Charge: If your robot is sitting on the shelf for more than 3 months, give the batteries a top-up charge. Ni-MH cells have a natural self-discharge rate; keeping them slightly charged prevents the voltage from dropping to a level where a charger might fail to recognize them.

Package Includes

• 1 x Pair (2 Cells) of Accuplus AA 1800mAh Ni-MH Rechargeable Batteries

Disclaimer

Images are for reference; actual labeling or wrapper color may vary by batch. Specifications subject to change by manufacturer. Do not short-circuit or mix with different battery chemistries.