Jeff Layman wrote:
On 27/08/2020 17:17, JohnP wrote:


But what will the performance be like in 2 years time? Poor enought to
warrant a new battery - or will you put up with deminished performance.

If I remember I'll post a reply in August 2022.


One of the problems with all the Lithium batteries
in the house, is charge management. Not putting
too much charge in them. Putting too little charge
in them (due to self-discharge over time).

It's not particularly good, to leave them on the
charger for 9 months, until the next grass mowing season.
That keeps the battery at 100% too much of the time.

Depending on the quality of the battery, you might want
to check it every three months or so, to see what kind
of self-discharge rate it has. That's if it has a
fuel gauge. That's how often I check the laptop pack.
I charge it back up to 70-80% if it needs a charge.

If a multi-cell pack "goes below 0% charge", a
charger is not allowed to charge it. It "won't
take a charge" when that happens.

Multi-cell packs, one of the cells can become
reverse-biased when run below the limit and
any kind of load is applied. (Even running a LED
would be enough.) The reverse-biased cell plates
out metal, ruining the cell. Packs work best if
all the cells match and they all "go downhill"
at the same moment.

https://batteryuniversity.com/learn/...ased_batteries

Paul