Battery Tender Plus 12V Light Flashing

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.

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

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

Perfect for the right occasions!!! Let's first talk about the mounting option accessories that ship with it so you can configure it to mount to cameras, providing various solutions. That's sooo smart. The build... DTap and other sources are well placed and can be used for multitudes of equipment. Crazy. The battery lasts a. Long. Long. Time!! I used it for more than it's "intended" purpose on a music video shoot. I rigged a 7" 12v monitor (DTap), powered a follow focus knob (5V), a wireless HD video receiver (12v), and .... something else. Effortless. The team loved the rig!!... you could see the gears in their minds spinning with possibilities !!!!!! Think outside of the box with this unit. Each item also had a battery attached for backup power IN CASE the handle dropped out at anytime. At that point, it could still be a handle. It lasted the ENTIRE duration of my needs... easy 6 hours without depleting. It's chunky even in a large hand, so be mindful of fatigue if rigged onto a heavy system. I first used it on a caged BMD 6K and it flowed easily for 3.5 hours. It powered the camera, and a 7" monitor for what I recall to be the entire live event (intermittent use, but powered up 85% of the time) Have a great time with the unit!!! I got mine on Daily Deal for about 25% off. I'm a fan!!!

Seriously, this thing is great. Just plop in up to 2 batteries, tells you their status and juices them up. They still have a good load, just take out the battery and skip the charge. Very easy to manage your set of batteries. Clear indication of battery status no reading, arcane, flashing / not flashing, is that amber or orange.... Works well in car also and does not require a power brick just a universal 2 prong power cord. Charging is quick but not overly (quicker = less battery life due to the heat). I have use mine with Fujifilm X I understand other adaptors are available. Most fujifilm users have or should have multiple batteries: I Higly recommended this

it should be 12v dc for power.

Makes setting up and repositioning lights easier. Plus using a battery with the light eliminates the headache of tripping over tangled cables.

got this Plus battery for when i get better at this. i'll be ready