I bought a Lionel train that had quit working. The speaker wires had come loose at the coupler and shorted out the control circuit board. I needed to solder new wires on the coupler but didn't have any schematics to tell me which was the positive or negative side of the speaker. I used one of the single battery holders to use an AA battery to determine polarity and it worked great. A couple of soldered wires and a new circuit board later and I have a working Lionel train set.I only needed one battery holder but this was more economical to purchase, and I figure my son and grand-kids will find uses for the rest.
🔋 EBL Battery Charger Combo: Rechargeable AA Battery 2800mAh (4pcs) and AAA Battery 1100mAh (4pcs) + Charger for AA/AAA/C/D NiMH Batteries
39 Review
EBL Rechargeable AA Batteries 2300mAh - Long Lasting Battery (8 Counts) + Charger for AA AAA Batteries
47 Review
5-Pack EBL 9V Rechargeable Lithium Ion Batteries With 600MAh Capacity And 5-Bay Charger For Smoke Alarm Detectors - 2A Input
34 Review
Dlyfull LCD Battery Tester - Universal Checker For AA AAA C D 9V CR2032 CR123A & More, 2X AAA Batteries Included
34 Review