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aunstarwei 42V 2A Battery Charger for 10 Series 36V Li-ion Battery Pack with DC 5.5x2.1mm Plug

£9.9£99Clearance
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Fan chargers are good, especially at higher charging amperes such as 5A.Charger fan may not have if they are well designed while charging they are just a little warm.The biggest charging load is at the beginning, then the highest current flows. are also labeled chargers for lead batteries and lifepo4these chargers have a charging voltage even higher about 43.8V for a lead-acid battery can be even higher by 0.2V. Why just charge by only 42V? The first advice is to buy the charger with the correct charging voltage, the battery does not overcharge but charges correctly.Many stores sell chargers labeled as “36V Charger”. Attention 36V is only nominal voltage, the actual value of the charging voltage is higher for 36V li-ion batteries is charging voltage 42V ! In you electric scooter have 7,8Ah 36V battery , manufacturer used Samsung 35E (INR18650-35E ) his the charging current is 1A per cell (2A is maximum but not recommended by the manufacturer reduces the service life)

You have two cels in paralel connections 2×3,4Ah=7,2 Ah and charging current can be about 2A. This also means that you can use a 2 A charger and not use a 5 A charger.

Li-ion batteries are made from smaller 18650 cells or prismatic cells ,Each of these 18650 cells has a nominal voltage of 3.6V and a charging voltage of 4.2V, these cells are connected 10 in series, so it is 36V only as a nominal voltage and 42 is the charging voltage. When charging for the first time, monitor the temperature of the charger as well as the battery, if possible,The charger may be warm but the battery should remain lukewarm

In some cases, the manufacturer delivers an unnecessary low charger along with the product, then it takes too long to charger The charger turns green after charging and stops charging when the voltage should be 42V (with 36V Li-ion charger) Higher voltage than 42V shortens battery life or complete destroy his,The BMS could stop the wrong charger but sometimes this electrical circuit also burnsespecially if the voltage is 92V as with aliexpress charger. 2A charging power or more power is better ? If you have a small battery with a smaller capacity of 7.2Ah 5.2 Ah, up to about 11Ah i I recommend charger 2A output.The 2A current is optimal for smaller 36V Li-ion batteriesI’ll explain why:

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