Andrew wrote:
On 25/04/2021 01:27, tony sayer wrote:
I've got a rather elderly Motorola which is a superb phone for what i
need. However its now some years old and in need of a new battery.

Can anyone recommend a battery seller who supplies decent reliable long
lasting batteries?, I see on fleabay some as cheap as a couple of quid
surely at that price the quality must suffer?, don't mind paying more
for a decent product its a MOTO G3 type number XT1541

TIA!..


Is there anyway of getting inside the battery pack with a
dremel or similar and identifying what type of cells it
uses, and then sourcing them ?.

That's unnecessary. It's a single cell.
The entire rectangular thing, is a cell.

Check out the operating voltage as proof.

https://i.postimg.cc/wMG9QJ93/fc40-single-cell-pack.gif

It's the same concept as the battery for my
digital camera. A single cell.

The quoted voltage is 3.8V. It probably charge-terminates
at 4.3V, and after it settles, the open circuit voltage is
3.8V. If you look at one of your tool-packs, it could
be 4*3.6V = 14.4V. They quote the resting voltage, rather
than the charge-termination voltage.

The benefit of single cell packs, is you can
run them flat without risk of reverse-bias. A
charger designed for such things, will charge
them all the way from zero. That's why the chargers
for such things, are designed for the specific item
or form factor, so you won't be using the charger
for some other purpose. The form factor also
prevents polarity reversal (only one way to insert pack).
Some even come with three contacts, and one of the
contacts is an "enable". This is intended to make it
harder to short the pack. The one in the example is
two wire, uses a female connector and is "fully armed".

Paul