Rechargeable lithium 9V battery.

Ah. Good point. The protection circuit will just shut off suddenly when at low Li ion threshold whereas NiMH will just keep sagging until alarm is unhappy and emits chirping sound. (always in middle of night). Thank you. So they will be used in my meters which use 9v.

I wouldn't recommend using them in alarms as the output will just cut off with no warning.

Big Clive

I purchased two kinds from amazon. One version had the mini usb plug in the side like BC showed and another version which uses a charger into which batteries are plugged. I have successfully charged all batteries to full and plan to let them just sit for months to see how much they self discharge. The reviews were numerous and generally very positive. Of course you will get one or two who received a dud and were replaced. Many people used them in alarms and music stuff. I use NiMH in my two alarms currently but will try these later just for the experiment. The alarms start chirping when battery is getting low so I am interested to see how these work.

I'm seeing the capacity complaint very often on these rechargeable alkaline replacement cells. The D cells seem to self discharge across most brands, I'm guessing because the DC-DC converter NEVER shuts off, even when outside of a device, so it just bucks itself to death on the shelf.

Dustin

I had an older version of one of these and it was terrible, horrid self-drain (less than a month) and horrendous switching noise, similar to that link Russ shared. Also poorly made. Yours looks much much better, & the NiMH batteries I got instead are finally packing in so perhaps I should try one of these newer ones.

Anton

You can find Znter batteries (and pics of labels) on ebay...they do a whole range including AA and AAA

LANDLINEMAN.com

It's particularly interesting that one of their batteries had only half the capacity. I resoldered the connection between the two cells in the unit because it looked a bit dry. Worst case there is one cell being flat and one fully charged when the contacts intermittently bridge. I'm going to add that bit to the description.

Big Clive

I wouldn't use it in a smoke detector. The self discharge is too fast and it will just go from full 9V to zero without warning.

Big Clive

Keep in mind that it replaces a LOT of standard alkaline PP3 batteries.

Big Clive

I found this review thread from 2016: http://budgetlightforum.com/node/51493. The final comment says that they are rubbish for wireless and radios due to very high RFI. Pitty.

Very nice, but too expensive for use in a smoke detector. But perhaps the price will fall.

Andrew Donaldson

This is a nicely designed thing. Thanks much for the journey! Very cool!

Michael Thompson

I like this, great discovery and I'll be purchasing some to keep on the van for my tone and probe set which is always dying and making funny warbly chicken noises mid trace...very handy indeed, I like it.

LANDLINEMAN.com

Very nice. Unfortunately with the extra discharge from the circuitry not really suitable for my typical devices (smoke detectors, etc). But would be great for those few LED devices that use 9V such as torches, head lamps, and I may even have a EL wire driver somewhere that is 9V.

09Klr650

Li-Ploymer. Sounds revolutionary.

Almost too posh for BCDC :)

I tried my best. That fine precision doesn't exist on a phone. Also, none of the controls will remove a well placed thumb. An intentional moment or so, wont hurt anyone. Clive does it for the images & circuits, why not the occasional product label?

Mike Cowen

At the risk of stating the obvious ... I always click on the YouTube icon to watch the video there. On YouTube, space bar or click in various areas to pause, left and right arrow keys to skip backward and forward a few seconds, and (the big one for me) < and > keys to move one frame at a time.

Clive, PLEASE, for those items with text on them, could you PLEASE *consciously* pause for just 1 second with the text visible and stationary so we curious ones can pause and read it? Yes, even the battery. It would have taken literally 4 seconds! Front, side, back, battery. Done. Every time the text was almost visible, you'd flip past it, it was at an odd angle, or you'd have your fingers covering it. Mucho obrigado!

Mike Cowen

As you said this kind of thing is useful for audio equipment, it would be interesting to hook it up to an oscilloscope and test it under load to see if the circuit generates any kind of noise. It's a pretty safe bet that stuff meant to be powered by batteries doesn't have any kind of filtering, so it might actually disturb the function.

horrovac

Neat battery

Quite expensive on ebay - €7.32 + €10.50 postage from China. Edit - on Amazon they are from about £13 up.

John Carr

Where are these available Im In trumped land,so you never know whats going on. that is a neat little batt Cost? My cheap china meters do better on 9volt batteries my B&k is a dinasour figure thanks BCDC

William Nimmo

I really wouldn't recommend something like this for a safety device

Chewie

Clive never sleeps, he only tinkers <3

Chewie

Hmm… 🧐 I wonder how reliable this would be in say my Smoke Alarms 💨🚨??? How often would you have to recharge this vs just using an alkaline for a smoke detector???

Zane Revai

I have one of these. I use it for my pre-amp.