This works just fine and is sturdy enough that I feel it will last a long lifetime. My only complaint is that a battery that is too weak to run some heavier-drain devices still registers in the "good" range. That is, a battery that is clearly on its way out still registers at 90% on its readout. But once you know that, you can pretty well judge the battery's draining state, even if device says "good".
EBL Rechargeable AA Batteries 2300mAh - Long Lasting Battery (8 Counts) + Charger for AA AAA Batteries
47 Review
Dlyfull LCD Battery Tester - Universal Checker For AA AAA C D 9V CR2032 CR123A & More, 2X AAA Batteries Included
34 Review
🔋 EBL Battery Charger Combo: Rechargeable AA Battery 2800mAh (4pcs) and AAA Battery 1100mAh (4pcs) + Charger for AA/AAA/C/D NiMH Batteries
39 Review
LCD Battery Tester For Universal Battery Types - AA, AAA, C, D, 9V, CR2032, CR123A, CR2, CRV3, 2CR5, CRP2, 1.5V/3V Button Cells With Included AAA Battery
29 Review