What volts, amp-hours and newton-metres mean
On batteries and drills you often see V, Ah and Nm. They are not one “power” number. Examples from Scheppach batteries and cordless drills. Choosing the machine itself: how to choose a cordless drill.
V — voltage and platform
Volts (V) are battery voltage. SBP2.0 and SBP4.0 are both 20 V. BC-CD50SC-X kit also runs on 20 V. Same V means one manufacturer platform — not that any other 20 V pack will fit.
SBP2.0 works with Scheppach 20 V tools, but GEN2 does not fit GEN1. Worx WA3639 is also 20 V / 2.0 Ah, yet another brand. Two “20 V” labels are not interchangeable.
Ah — how long, not how hard
Amp-hours (Ah) are capacity. SBP2.0 is 2.0 Ah; SBP4.0 is 4.0 Ah. Higher Ah usually means longer runtime, not higher torque. Read torque on the tool (Nm), not on the battery.
Nm — torque of the machine
Newton-metres (Nm) belong to the drill, not the battery.
- C-DTB74/1-X — up to 45 Nm (20 V 2.0 Ah in the kit).
- BC-CD50SC-X — up to 50 Nm.
- BC-DD60-X kit — up to 60 Nm, 2.0 Ah in the kit.
- BC-CD70SC-X — up to 70 Nm.
- BC-CD150-X — up to 150 Nm.
50 Nm with 2.0 Ah and 50 Nm with 4.0 Ah is the same torque — runtime differs.
Charger A ≠ battery Ah
Common questions
Is 4.0 Ah “stronger” than 2.0 Ah?
Usually longer runtime. Torque still sits on the tool’s Nm line.
Are all 20 V tools in the shop one system?
No. Scheppach 20 V plus GEN1/GEN2 warning. Worx 20 V is another product.
In short
V = platform, Ah = how long, Nm = how hard the machine turns, A on the charger = how fast it charges. Compare those lines on the specific model before you buy.
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