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Am I missing something or is this battery charger just insane? Answered

I bought this cheap charger that charges 2 Li-ion 18650 on eBay: https://www.ebay.com/itm/182586752606?ssPageName=S...

But it charges them in PARALLEL!

  • So if I put charge two batteries that have a different voltage, the charger will drain one and charge the other one at a pretty high current.
  • If one battery is older, or has a different chemistry, it must not healthy to charge both.
  • If I decide to charge only one, will it push too much current into it?
  • If someone accidentally inserts one in reverse...
  • If you want to charge 2 batteries that are exactly the same, make the charger a built-in feature in the device that uses the batteries, why disconnect them. Used batteries will always have a different voltage!

I used to charge them with this cheaper charger, but I recently found out it charges them to 4.30V sometimes, and I want to be able to charge more than one at once...

I don't care about charge time since I have a bunch of batteries always ready to use, prefer not to have our house burn down, but don't want to spend too much $ on a charger. Watt do you think of these? I don't want to pay 8x the price to have a charger tell me the voltage and be limited by USB cable's current...

https://www.ebay.com/itm/VONTAR-LCD-Intelligent-Ba... ("smartest" & most expensive. Still, only tells the voltage)

https://www.ebay.com/itm/Liitokala-Lii-202-18650-2... (confusing)

https://www.ebay.com/itm/4-Slot-Smart-Battery-Char... (not "smart" but seems the best IMO)

https://www.ebay.com/itm/50-1000MA-Lithium-li-ion-... (Hmmm...)

Because we all know what can happen with an 18650 gets angry... Though I have used this charger to charge 15 y/o 19650s that were 0V, back to normal and they are like new now...

Discussions

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gandymarsh

2 months ago

Just FYI those charging boards need at least 1 amp to power them. I would suggest using a wall wart that is capable of supplying 1 or 2 amps instead of your computer.

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Yonatan24gandymarsh

Reply 8 weeks ago

Yup, which is why after posting my comment I changed my mind and will buy parts to make one that charges two batteries - I believe my biggest 5V power supply can supply only 3A...

It's also half the price and how could I say no to paying half as much... :)

Don't like using USBs as I'm limited by the amount of USB chargers I own that aren't eBay-bought phone killers and chinese cords that can actually supply enough current, so it's great I can connect it to a power supply too!

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gandymarsh

2 months ago

I've never heard of the ones that you linked to that have brand names. I have a Nitecore i4 that works well but is slow when charging 4 cells. On ECF, there are many people that recommend Xtar chargers. If you want a DIY solution, you could buy some TP4056 charging boards on ebay. They use a 5 volt mini or micro USB cable. They require some soldering and 18650 battery holders. https://www.ebay.com/itm/10pcs-TP4056-Micro-USB-Charger-Module-5V-1A-18650-Lithium-Battery-Charging-Board-/272570928685?hash=item3f767e4e2d

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InstaT

2 months ago

Do you make one industry for me?
I need like him 3d printer but i need big one 500×500 ×600 how mach mone and taem and send for ksa

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Yonatan24InstaT

Reply 2 months ago

I do not understand what you mean. Can you ask at a different website?