最近, we received a report from client that one Keeppower IMR18350 1200mAh UH1835P unprotected lithium battery could no longer be recognized or charged by a charger. Preliminary analysis suggests that this issue was likely caused by the battery being left unused in a flashlight device for an extended period. (After checking with authorized dealer, the purchase record is 6 years ago, though it is out of warranty policy now, we still try to provide a responsible after-sales service)
- Characteristics of Batteries Without Protection Circuits
Lithium batteries without a Protection Circuit Module (PCM) lack over-discharge protection. Even when the battery voltage drops below the safe operating range, they cannot automatically cut off the circuit like protected batteries.
When a battery is left in a device (懐中電灯など, remote control, electronic toy, etc.) for a long time, even if the device is turned off, its internal circuitry may still continuously consume a small amount of battery current. Without the intervention of a protection circuit, the battery will continue to discharge until its voltage becomes too low, or it is completely depleted. This damages its internal chemical structure, rendering it unable to be recharged – essentially, the rechargeable battery is used up like a disposable one.
- Risks of Placing Batteries in Devices for Long Periods
- Battery Failure:Over-discharge can cause irreversible damage to the internal structure of lithium-ion batteries.
- Safety Hazards:Severely over-discharged batteries may heat up, swell, or even become dangerous when attempting to recharge them.
- Device Malfunction:Batteries with unstable voltage can also affect the normal operation of the device.
- Recommendations
- Prompt Removal:If a device will not be used for an extended period, be sure to remove the battery.
- Proper Storage:Store batteries in dedicated Keeppower plastic battery cases to avoid short circuits and physical damage.
- Choose Protected Batteries:If the device is known to have continuous small current consumption, it is advisable to use batteries with protection circuits.
To learn more about Keeppower batteries, please contact the Keeppower team or leave a message. We are always at your service.