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393 battery (SR48)
SR48: 1.55 V silver oxide button cell, 7.9 mm × 5.4 mm, about 75 mAh (116 mWh). Same battery: SR754. Also fits: LR754.
1.55 Vvoltage
7.9 mmdiameter, 0.311 in
5.4 mmthick, 0.213 in
≈ 75 mAhcapacity
SR48: what to know
- The tallest 7.9 mm cell at 5.4 mm; 393 is the high-drain and 309 the low-drain version, and the LR754 (AG5) its alkaline twin.
SR48 equivalents
SR754
- 393: SR48W
- 309: SR48SW
- AG5: alkaline
- LR754: alkaline
Can I use another battery instead of an SR48?
| Battery | Size | Volts | Works? | Why |
|---|---|---|---|---|
| LR754 | 7.9 mm × 5.4 mm | 1.5 V | Yes | Same size; alkaline is cheaper but fades sooner. |
| LR41 | 7.9 mm × 3.6 mm | 1.5 V | Short-term | 1.8 mm thinner: may sit loose; fine short-term. |
| Size 312 | 7.9 mm × 3.6 mm | 1.45 V | No | Zinc-air cells need air holes; not for sealed devices. |
| SR41 | 7.9 mm × 3.6 mm | 1.55 V | Short-term | 1.8 mm thinner: may sit loose; fine short-term. |
| Size 13 | 7.9 mm × 5.4 mm | 1.45 V | No | Zinc-air cells need air holes; not for sealed devices. |
What uses an SR48 battery?
- Watches
- Small calculators
393 = low drain (analog watches), 309 = high drain (digital, backlights). Same 7.9 mm × 5.4 mm cell; either works in most watches.
Alkaline version: LR754 (AG5), about 50 mAh vs 75 mAh; cheaper but its voltage sags.