Lithium-ion battery factory in Shandong direct parameters: Nominal voltage: 3.7V Nominal capacity: 420 (mAh) battery Dimensions: 6 * 20 * 40 (mm) (the size can be customized) battery internal resistance: ≤150 (mΩ) charging current : Standard charge 0.5C, 1.0C fast charging standard charging methods: 0.5C CC (constant current) charged to 4.25V, then CV (constant voltage 4.2V) Charge until the charge current <0.05C maximum charging current: 1CmA maximum discharge current: 2CmA Charging time: 3-5hrs (standard), 2.5hrs (fast) charge and discharge times: more than 450 times the overcharge protection: in between the P + and P- plus charger to charge the battery, the battery voltage charge to overcharge detection voltage (4.25 ± 0.04V), the protection circuit to cut off the charging path, to achieve overcharge protection. Over-discharge protection: in between the P + and P- connected load to the battery discharge when the battery voltage drops to over-discharge voltage (2.35 ± 0.01), the protection circuit, shut off the discharge path to achieve the over-discharge protection. Short circuit protection: When the P + and P- short circuit protection circuit will act quickly in 5-50uS, cut off access, short-circuit protection. Current protection: When V- terminal voltage of (0.15 ± 0.02V), the protection circuit will act quickly in 5-26ms, cut off access, overcurrent protection. Temperature: -20 / + 60 (℃) Application: all kinds of electronic products, lighting lamps, mobile products, digital products, IT products, instrumentation, IC card terminals, medical equipment and other models: 602 040 Nominal Capacity: 420mAh (standard charge and discharge) Length: 40.2 ± 0.1 mm Width: 20.2 ± 0.1 mm height: 6 ± 0.2 mm Nominal voltage: 3.7 V internal impedance: ≤ 150 milliohms (including PTC) Security: Anti-explosion, no leakage, not hot. PTC: short circuit inside the battery disconnect safety switch automatically, immediately return to normal after the non-short-circuit voltage; Seiko protection board: overcharge, over discharge, over-power, short circuit protection, etc. Delivery: Bulk delivery 7-10 days, sample delivery period of 2-3 days, and some models can be delivered 24 hours, six hours to send samples to test! (if any special requirements (custom plug connector, unconventional size, capacity, and other unconventional electrical performance requirements, delivery by the customer agree that the appropriate extension)) factory direct selling price, can build all kinds of voltage, capacity, type, quality and cheap, large more favorable. Sincerely look forward to working with you! 1, it is recommended to use Alipay secured transactions. Safe, convenient, guaranteed! 2, Guangdong Province, courier or logistics support collection, cash on delivery. 3, Guangdong province have Nadu state outlets or new logistics support payment collection. 4, other transactions can call deliberations.