On Fri, 08 Dec 2017 00:20:45 +0100, Emanuel Berg
wrote:

YT wrote:

I think the five different batteries will
work with any (of those) tools. All batteries
are 18V Lithium but the Ah's are 1.3, 1.5,
2.5, 4.0 and 5.0. So I think they have the
same power and interface, thus works for all,
but the "Ah" (Ampere hour) unit seems to
suggest the longest use before recharge for
the 5.0 Ah version. Yes, that must be it.

One has to wonder tho why there are *five*
batteries? One light and small and one heavy
and big I understand. Yet another one in the
middle? Fine. But five? Can there really be
a size/weight advantage anyone would ever
notice with the 1.3 version compared to
the 1.5?

The different batter capacities are probably there because various
tools require different power levels. A light weight 1/4" drill will
obviously require a smaller motor to power it than (for example) a
1/2" hammer drill designed to drill holes in concrete.

A 1.5 HR battery that would power a small 1.4" drill for an hour would
power the larger drill for perhaps 15 minutes.
--
Cheers,

John B.