Tectra 450mAh AAAA Batteries, 4-Pack AAAA Rechargeable Ni-MH Batteries with AA AAA AAAA Ni-MH Universal Smart Battery Charger for Surface Pen Active Stylus
 
Product Features
  

         
Battery Type: Rechargeable Ni-Mh AAAA Battery; Capacity: 450mAh; Voltage: 1.2V; Premium Grade A cell for longer battery life with no memory effect;
         
Compatible With: Surface pro 3/4 pen, Digital pen MS(Microsoft)surface pen, Dell digital stylus, Bamboo ink pen, Active stylus pens, Asus stylus, Sonic tooth scaler, Video game controllers, Bluetooth headsets, Glucose and blood monitors.
         
Ni-MH eco-friendly cell, doesnt contain Hg/Cd/Pb, makes no pollution to the environment, and using DBCK steel shell which can protect the battery against explosion due to overpressure.
         
4-slots independent charger design is convenient to charge batteries simultaneously and independently, saving your time, saving your batteries' life. Build with micro-USB input, you can charge your batteries with wall charger, car charger, laptop and power bank.
         
Smart charging LCD indicates when charging is completed and prevents battery from overcharging, of course you can also check the charging process from the LCD display. Portable size charging set easy to carry when out or travel, no need to worry about short of power.