LR1130 vs SR1130W
The LR1130 and the 389 occupy the same 11.6 by 3.1 mm case and interchange in any device. The LR1130 (also AG10 or LR54) is 1.5 volt alkaline with 50 to 70 mAh; the 389 is the silver-oxide SR1130W at 1.55 volts with 70 to 85 mAh and a flat discharge curve.
| LR1130 | SR1130W | |
|---|---|---|
| Chemistry | Alkaline (Zn/MnO2) | Silver oxide (Ag2O) |
| Voltage | 1.5 V | 1.55 V |
| Diameter | 11.6 mm | 11.6 mm |
| Height | 3.1 mm | 3.05 mm |
| Capacity | 50-70 mAh | 70-85 mAh |
| Also sold as | AG10, LR54, L1131, 189 | 389, SR54, V389, SR1130SW (390, low drain) |
The alkaline version rules the low end of the market: laser pointers, dollar-store gadgets, musical greeting cards and toy badges ship with AG10 cells because they cost pennies. For those devices, replacing like with like is rational, especially for pointers that eat three cells at a time.
The silver 389, and its low-drain sibling the 390, serve the same case size in watches, calculators and instruments. The capacity advantage is real but modest; the voltage behavior is the bigger difference. A quartz watch on a fading alkaline cell loses accuracy for months before stopping, while on silver oxide it runs true until the end. Instruments with LCD readouts similarly fade and flicker on sagging alkaline voltage.
Note the naming tangle in this size: LR1130 and LR54 are the same alkaline cell, and 389 and 390 are the same silver cell in high-drain and low-drain tunings. All four designations share one set of dimensions.