Can you mix one battery brand and a different brand or age?
One battery brand and A different brand or age
No — it damages something or fails
No — mixing brands, ages or chemistries in one device causes leaks.
What actually happens
Cells in series discharge together, and a stronger cell will drive current backwards through a weaker one once it is flat. In an alkaline cell that forces hydrogen generation and pressure, and the cell vents potassium hydroxide — the white crust that destroys a remote control. Mixing a fresh cell with a partly used one guarantees an imbalance, and mixing alkaline with rechargeable adds a voltage difference on top.
What to do instead
Replace all cells in a device at once, same brand and same type, and take them out of anything being stored.
Around the house
| Combination | Verdict | Why |
|---|---|---|
| Vinegar and marble or limestone | Do not | No. Acid etches calcium carbonate permanently. |
| Bleach and laundry detergent | Do not | Usually safe but wasteful — and unsafe if the detergent contains ammonia. |
Common questions
- Can you mix one battery brand and a different brand or age?
- No — it damages something or fails. No — mixing brands, ages or chemistries in one device causes leaks.
- What happens if you do?
- Cells in series discharge together, and a stronger cell will drive current backwards through a weaker one once it is flat. In an alkaline cell that forces hydrogen generation and pressure, and the cell vents potassium hydroxide — the white crust that destroys a remote control. Mixing a fresh cell with a partly used one guarantees an imbalance, and mixing alkaline with rechargeable adds a voltage difference on top.
- What should I do instead?
- Replace all cells in a device at once, same brand and same type, and take them out of anything being stored.
Related pages
- Vinegar and marble or limestone No — it damages something or fails
- Bleach and laundry detergent No — it damages something or fails
- Bleach and ammonia Also produces a toxic gas
- Bleach and vinegar Also produces a toxic gas
- Bleach and toilet cleaner Also produces a toxic gas
- Bleach and rubbing alcohol Also produces a toxic gas
- Hazard symbols What the pictogram on the bottle actually requires
Sources
- Official vendor product documentation — At One Place