Re: Got 4Ah, not 5Ah, battery 18V (20V) - done right thing?

On Thu, 16 May 2024 15:43:01 +0100, Richard Smith <null@void.com>
wrote:

Hi there
>
Ran SDS out of battery in one session at the mine - first time.
>
Is 18V - believe it's badged in the USA as 20V, but the physics of the
Li-ion cells surely says in reality it's the same batteries and
voltage (?).
>
Went by tool store - no 5Ah batteries I asked for.
Said well it's 12 UKPounds per Amp-hour, and we do have 4Ah
batteries.
>
Thinking - well take two identical 4Ah batteries, swap occasionally,
running-down charge in both?
>
4Ah battery is better in every other tool which takes that form of
battery - screwdrivers, twist-drill drills, etc.
>
But the draw of the "big" SDS drill - the biggest which takes the
"small" batteries - that power draw would go across more cells if a
5Ah battery.  Would have been better?
>
What do you say?

Amp-hours measures total stored charge, but I think your question is
different, basically if the smaller battery will affect the ability to
drill hard granite. 

If drilling isn't much affected, then the take two and swap approach
is perfectly serviceable.

My instinct is that drilling ability will be about the same, but will
make fewer drilled holes per charge.  Unless these batteries are
awfully expensive, I'd just try it.

Joe Gwinn

>
PS - SDS drill drilling the sockets in granite to insert the
feathers&wedge to split granite boulders - simply a regular workhorse
now.
Also use for "misc" other tasks - drill holes into which hammer in wood
for screws holding light-fittings, etc, etc.