All batteries, regardless of the chemistry or manufacturer, are affected by self-discharge. Age, cycling, and storage conditions are just a few factors that influence a battery’s self-discharge rate. Some battery chemistries are more prone to self-discharge than others. The below table summarizes the expected self-discharge rates of battery chemistries offered by HDP.
| Battery Chemistry | Estimated Self-Discharge |
|---|---|
| Primary Lithium-metal | 10% in 5 years |
| Rechargeable Lithium Ion | 5% in 24h, then 1 - 2% per month (plus 3% for protection circuit) |
| Nickel-Metal Hydride | 10 - 15% in 24h, then 10 - 15% per month |
| Low self-discharge (LSD) Nickel Metal Hydride | 15% in 1 year |
