After testing these EBL C batteries in my vintage radio collection and Mag-Lights, I can confidently say they're a reliable option for those needing rechargeable C cells. The 5000mAh capacity is impressive compared to competitors like Energizer's measly 2500mAh offerings.

The batteries arrived with minimal charge (as expected), but after a few charge-discharge cycles, they started performing at their best. My XTAR Dragon charger tests showed they deliver about 84% of their advertised capacity in real-world use - not perfect, but better than the D-cell versions from the same brand.

What I love most is the included storage case - no more loose batteries rolling around in drawers! The low self-discharge feature also means I can leave them unused for months without worrying about complete drainage.

However, be aware these are 1.2V instead of standard alkaline's 1.5V. They work fine in most devices, but my Meccano robot wouldn't run properly with the lower voltage. Also, charging takes forever - we're talking over a day for full capacity.

For LED candles and radios though? Perfect match. One user reported replacing six alkaline Cs monthly with these rechargeables - that's serious savings over time!

The occasional quality control issue pops up (like that wonky LCD charger display), but EBL's customer service has been responsive when problems arise.

Bottom line: If you need affordable, eco-friendly power for medium-drain devices and don't mind the long charge times, these EBLs deliver solid performance at a reasonable price point.