ActiveAl
(ActiveAl)
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My Battery-Resistance-Voltmeter-Internal-Impedance-Meter-LCD-Rechargeable-SM8124A arrived today and, using it, I took measurements of the six LiitoKala Factory 30Q batteries (Table 1), and six 30Q batteries purchased from Orbtronics (Table 2). The tabulated data indicate two things: (1) The LiitoKala Factory batteries are not 30Qs, and (2) the SM8124A resistance meter (a) provides consistent internal resistance readings that are reasonable, and (b) is a valid tool for comparing batteries.
Table 1 - LiitoKala Factory Store 30Q
Internal Resistance Measurements (mΩ)
| Cell |
Trial One |
Trial Two |
Trial Three |
Trial Four |
Avg |
| 1 |
27.8 |
29.0 |
28.9 |
29.1 |
28.5 |
| 2 |
25.5 |
25.5 |
25.4 |
25.4 |
25.5 |
| 3 |
25.5 |
25.4 |
25.5 |
26.6 |
25.5 |
| 4 |
27.7 |
27.8 |
28.0 |
28.0 |
27.9 |
| 5 |
26.3 |
26.2 |
26.3 |
26.2 |
26.3 |
| 6 |
25.2 |
25.2 |
25.2 |
25.3 |
25.2 |
Table 2 - Orbtronics 30Q
Internal Resistance Measurements (mΩ)
| Cell |
Trial One |
Trial Two |
Trial Three |
Trial Four |
Avg |
| 1 |
11.4 |
11.4 |
11.4 |
11.3 |
11.4 |
| 2 |
11.4 |
11.5 |
11.3 |
11.4 |
11.4 |
| 3 |
11.4 |
11.5 |
11.4 |
11.3 |
11.4 |
| 4 |
11.4 |
11.4 |
11.4 |
11.4 |
11.4 |
| 5 |
11.7 |
11.7 |
11.7 |
11.9 |
11.8 |
| 6 |
11.5 |
11.4 |
11.4 |
11.3 |
11.4 |
A reading was taken for each battery sequentially in each trial. The SM8124A advertises an accuracy of 0.1 mΩ for this measurement range.