TECNOIOT 5 pcs Battery Capacity Power Level Indicator Blue Display for 1S 4.2V 18650 Li ion Batteries

【1SBlueIndicator】☆☆☆ 1S 4.2V 18650 Lithium Li-ion Battery Capacity Indicator Power Level Tester Blue Display☆☆☆ 【Features】✔Blue Display✔4 Levels indicators✔The display is more intuitive and more beautiful 【Instructions-1】✎Connect the positive and negative terminals of the display board to the positive and negative terminals of the battery under test.The lithium battery group displays the power parameter: (The following data is the reference value, there will be a 2% error range)(Note: N is the number of battery segments) 【Instructions-2】✎1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity (note:N represents battery quantity)✎2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity 【Instructions-3】✎3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity ✎4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity✎5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery is less than 3.3V,and you can charge the battery