Traveller Battery Charger Green Light Flashing

As many others mentioned in the reviews, these batteries are now new old stock, as the newest ones were made in 2022 and will arrive completely discharged. DO NOT give up on them - the charger will initially show an error (chamber and calibration light flashing) - keep taking the battery off and putting it back on, and eventually it will start to charge. The key is to not leave it in the charger if the charger is showing the error code, you have to remove and replace the battery until the charger shows that it is charging (chamber light and 50% light flashing). After a few hours the 50% light should glow solid and 80% should start flashing, and eventually it will charge fully

Very good device but hardly fast speed and external light keep flashing green. But over all everything seem fine

Sturdy charger, green lights indicate when each battery is fully charged. Light weight.

I used this charger to charge the battery for my Olympus 8010 camera. When a depleted battery is placed in the charger, a red light goes on. When fully charged, a green light goes on. This charger will not overcharge the battery but bring it to a full charge, so leaving it in when the green light is on fully tops off the battery charge. The battery seems to have a longer charge as a result. I really like this battery chaarger.

This is a very nice headlamp, without two levels of white light, a red light and a flashing red light.  Having the battery pack on the back makes it much easier to balance and the straps are adjustable over a wide range.

My APC UPS sounded off every few hours with beeps and a flashing red light to let me know it was time to replace the battery. I ordered online and the battery arrived sooner than expected. I installed it and it's been working fine since. The part I especially like, I didn't have to shut everything off to install.

I bought this a month ago when the battery died (I unfortunately did not notice the low battery flashing light indicator). The replacement battery arrived very promptly, was easy to install, and my backup is operational again — and just in time because a tornado hit here a few days later and I lost power for 8 hours.

but it is unsettling to have the upstream light flashing

When I got this battery, I plugged it into the charger and the charger into the electrical outlet. I stared at the green charging light for 2 or so hours and, when it went off, I pulled it out and tossed it into my camera. My camera now works! Amazed!

This is so much better than the single charger that comes with the camera because it has two chargers AND mostly because you can tell how fully charged it is without just waiting for the charger to stop flashing. Huge improvement.