In order to your safety when you use Li-ion rechargeable battery, pls note some advices as following.
How to choose a safe Li-ion rechargeable battery?
- The safe Li-ion rechargeable battery must have control board inside.
- You can find a battery’s safety certificate on the battery, i.e. PSE
- The battery has many kinds itself protections
- Overcharged protection
b. Discharged protection
- Short-circuit protection
d. High/Low temperature protection
Overheated or overcharged Li-ion batteries may suffer thermal runaway and cell rupture, and in extreme cases this can lead to combustion. Deep discharge may short-circuit the cell, in which case recharging would be unsafe. To reduce these risks, Lithium-ion battery packs contain fail-safe circuit that shuts down the battery when its voltage is outside the safe range of 3–4.2 V per cell. When stored for long periods the small current draw of the protection circuitry itself may drain the battery below its shut down voltage; normal chargers are then ineffective. Many types of lithium-ion cell cannot be charged safely below 0°C.
Other safety features are required in each cell:
- shut-down separator (for over temperature)
- tear-away tab (for internal pressure)
- vent (pressure relief)
- thermal interrupt (over current/overcharging)
These safety features increase costs compared to nickel metal hydride batteries, but for your own or your consumers’ safety, these safety features are necessary.
Those very cheap lithium-ion batteries and products using them on the market tend to catch fire when being used or charged. More and more accidents of this kind, http://www.geomangear.com/index.php?main_page=page&id=17 as one of the recent examples, have happened and thus drew governments’ attention to regulate the rechargeable battery.
Product manufacturers and their following distributors/dealers should not pursue excess cost-down at the cost of end-users’ safety and property.