LONG_KEELER
Well-Known Member
With USB port.
Thought I might give them a punt. Round about £10 for two.
Any feedback to report ?
TIA
Thought I might give them a punt. Round about £10 for two.
Any feedback to report ?
TIA
AA Rechargeable Batteries Lithium 1.5v
- Thread starter LONG_KEELER
- Start date
RichardS
N/A
AA batteries with a USB port? Surely the voltage would not be sufficient from one AA battery to power a USB port? 
Richard
Richard
bedouin
Well-Known Member
I think the USB is for recharging the batteries themselves rather than charging something from the batteriesAA batteries with a USB port? Surely the voltage would not be sufficient from one AA battery to power a USB port?
Richard
Rappey
Well-Known Member
I think having a usb charge port in the battery is a great idea as so many of us have usb leads for our phones, making it very convinient
RichardS
N/A
Well that's something else that I've never heard of. Can you daisy chain the batteries together as charging every battery with a separate lead would seem to be a chore if you have a device which takes four AA's?
Richard
bedouin
Well-Known Member
USB splitters are common - so you can charge say 4 from a single USB output. The secret of course is to build the charging control into the battery itself rather than relying on the battery charger
Rappey
Well-Known Member
JumbleDuck
Well-Known Member
We looked into getting some a couple of years ago and concluded that the capacities are just too low to be worth it. I've had a look on Amazon and all the USB-rechargeable AAs there seem to be around 1000mAh whereas a standard alkaline is 2500mAh and a lithium (non-rechargeable) is around 3000mAh. Fine for saving the planet, maybe, but not great for actually powering stuff.
I suspect that it's partly because the charging circuitry just takes up too much of the package. USB-rechargeable D-cells with 10Ah are around, which seem like quite the business.
thinwater
Well-Known Member
Rechargeable Li is about 3500 mAh. Yes, I have used them and compared burn time. About triple NiCd.
JumbleDuck
Well-Known Member
Did yours have USB chargers built in? That seems to be what knocks capacity down.
thinwater
Well-Known Member
^^ No. However, they do charge at slightly higher voltage than NiCds, so the charger needs to be compatable. For example, if you drop them into solar patio lights, they don't charge.
bedouin
Well-Known Member
thinwater
Well-Known Member
JumbleDuck
Well-Known Member
Interesting, thanks. I wonder how they manage to pack in so much more than their competitors. Those are both at a level where I might well be tempted.
sailorbenji
Well-Known Member
Highly recommend the JUGEE brand rechargeable lithium batteries, available on AliExpress etc.
3000mAh and seem to be living up to that after around a year of almost constant use in IOT devices various.
Buy them with the charger which charges them very quickly....the batteries also have circuitry that drops the voltage from 1.5V to something lower when battery life is coming to an end...this triggers any built-in battery warnings for the device they are powering which is really handy...otherwise they would look full until suddenly they die.
3000mAh and seem to be living up to that after around a year of almost constant use in IOT devices various.
Buy them with the charger which charges them very quickly....the batteries also have circuitry that drops the voltage from 1.5V to something lower when battery life is coming to an end...this triggers any built-in battery warnings for the device they are powering which is really handy...otherwise they would look full until suddenly they die.
Snowgoose-1
Well-Known Member
I love the lithium aa's. Lighter for my hand helds . If you put 'project farm' in youtube he has done some great tests . Best bloke on youtube for me.
Rappey
Well-Known Member
3500mah are available in lithium with usb port.
I found the older batteries even at 3500mah didn't last in things such as digital cameras because they were only 1.2v and didn't take long until the voltage was low enough that the camera would shut down.
The lithium maintain 1.5v until they are empty.
Rechargeable Batteries AA 1.5v USB Lithium 3500mWh Solar Light Battery AA Holder | eBay
I found the older batteries even at 3500mah didn't last in things such as digital cameras because they were only 1.2v and didn't take long until the voltage was low enough that the camera would shut down.
The lithium maintain 1.5v until they are empty.
Rechargeable Batteries AA 1.5v USB Lithium 3500mWh Solar Light Battery AA Holder | eBay
penberth3
Well-Known Member
Good to know. I've got a camera that won't even switch on with 1.2V batteries!
JumbleDuck
Well-Known Member
My crew has a camera which eats alkalines because they fall below its minimum voltage when they are only slightly used up. Result: two or three hours' use and a set of batteries which is absolutely fine for something else. Lithium disposables cost much more but give a month's use. If lithium rechargeables play nicely they could be a good new solution.
