CR1620 3V Lithium Coin Cell Battery DL1620 KCR1620 BR1620 5 Pack. This high capacity button cell is suitable for most applications such as clocks, remote controls for car alarms, back up batteries and calculators. Also known as a DL1620 KCR1620 or BR1620, this battery is branded so lasts much longer than unbranded batteries. It is used in car or van key fobs, clocks, remote controls for car alarms, back up batteries and calculators.