On Tue, 24 Dec 2019 15:09:37 GMT, Pamela
wrote:

On 09:57 24 Dec 2019, Scott wrote:

On Mon, 23 Dec 2019 22:25:11 GMT, Pamela
wrote:

On 17:55 23 Dec 2019, newshound wrote:

On 23/12/2019 17:24, Scott wrote:
On Mon, 23 Dec 2019 16:49:00 GMT, Pamela
wrote:

On 14:25 23 Dec 2019, Tim+ wrote:

We have a handheld rechargeable Dyson that mostly works very well.
Recently it has started to seem like its battery is dying.

It lives on its charger under the stairs all the time but
it€„¢s started to €œdie€? after just 10-15 seconds of
use and displays a flashing blue €œlow battery€?
indicator. The thing is, if I put it back on charge for just 5
seconds it comes back to life and I can get many minutes of use out
off it before the battery really runs low.

Anyone else come across this?

Tim

I wouldn't leave a lithium ion battery on charge the whole time
because a full charge stresses the battery and shortens its life,
although that doesn't really account for your symptoms.

My friend refuses to accept this and insists her laptop is plugged
on all the time, even when using it. Maybe laptops are more
sophisticated.

She did the same with the cordless vacuum cleaner and the battery
failed in quite a short period.

Mine hangs on its charger. I kind of assume that Dyson's scientists
know how to make "safe" chargers.

The issue is not safety as lithium ions batteries and chargers are
usually well protected but that the battery is stressed when it contains
a full charge. I'm told it also physically swells.

Those smartphone users trying to conserve lithium ion batteries will not
charge above 80% or so.

I thought the software took care of that by its definition of 100%.

I'm no expert but as I understand it, lithium ion is so prone to
overheating and catching fire that there's safety protection against
dangerous overcharge in both cell and charger.

However overcharging stress occurs long before dangerous overcharge,
especially if temperature rises, and affects cell life more than safety.

I'm no expert either but I thought the purpose of the battery
management was not optimise the battery, not just to prevent dangerous
overcharging.

There are mixed messages on how adverse this is. There's better agreement
that low discharge is even worse.

Again, no expert but I thought battery life was defined by the number
of charge/discharge cycles and therefore if you kept topping up, the
battery would wear out more quickly.