This page was machine-translated from German. German original version
Battery calculator
Three tools to help you understand your battery better. All results are calculated examples – the cell type and configuration of the actual battery are what count.
Decode the rating plate
Enter the voltage and capacity from the rating plate. The calculator shows how many cells in series are likely and which parallel configurations match common cell sizes.
Voltage ratings such as “36 V” are nominal values (lithium-ion 3.6–3.7 V per cell, nickel 1.2 V, LiFePO₄ 3.2 V).[1] The number of cells in parallel cannot be determined reliably from volts and Ah alone; only opening the battery provides certainty.
Estimate a capacity upgrade
With cell replacement, the number and arrangement of the cells remain the same. More capacity only comes from cells with more Ah. This is how much difference it could make:
Compare only cells of the same cell chemistry and design as in the existing battery. Changing the cell chemistry, for example from nickel to lithium, is not a simple cell replacement, because the charger and electronics must be suitable for it. Whether an upgrade is possible depends on the available cells, the BMS, the motor and the charger. Range and running time also depend on the device, usage and temperature. Request an upgrade from Akku New
Calculate the configuration
Voltage, capacity and energy result from the configuration and the cell.[2]
Calculation: V = S × cell voltage, Ah = P × cell capacity, Wh = V × Ah. The cells are technical examples based on manufacturer data.[1]
Sources (2)
- Manufacturer data for the cells: LG (INR18650-MJ1, -M29, -M26/M26S, INR18650-HE2), Sony/Murata (US18650VTC4, VTC5, VTC6), Panasonic NCR18650PF and Axcom Sub-C (YT2000SCP, YT3000SCP), as technical examples; Molicel INR21700-P45B; Samsung INR21700-50E; Lithium Werks ANR26650M1B; LiFePO4 cell IFR32700 (retailer data). Link
- VDE (German Association for Electrical, Electronic and Information Technologies): FAQ Batterien [FAQ on batteries]. Link
Show us your battery
A photo of the battery and its rating plate and a short description of the fault are enough for an initial assessment.