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Posted

I have one of these magneto rechargeable led lanterns.

https://www.tevo.co.za/shop/outdoor/torches/magneto-rechargeable-led-lantern/?gclid=CjwKCAjwp7eUBhBeEiwAZbHwke7yNbRFiGNaq5BUzGS9jnMSBP0bbjqjeD-zhd72zubxwMrOc9OA-xoCHQgQAvD_BwE

It was really good at first but after a few months of usage with load shedding I can see it gets dim very quickly and does not last as long as it used to. Inside is a normal lead acid 6v 4ah battery. This battery is obviously not meant for repeated charging and discharging and I am looking for somethng to replace it with. I think a lithium battery may be the best option. Has anyone replaced the battery on these with a lithium battery and what has been your experience? Is the built in charger able to charge a lithium battery? Would an 18650 battery work here?

Posted
On 2022/05/25 at 11:39 AM, Vin said:

I have one of these magneto rechargeable led lanterns.

https://www.tevo.co.za/shop/outdoor/torches/magneto-rechargeable-led-lantern/?gclid=CjwKCAjwp7eUBhBeEiwAZbHwke7yNbRFiGNaq5BUzGS9jnMSBP0bbjqjeD-zhd72zubxwMrOc9OA-xoCHQgQAvD_BwE

It was really good at first but after a few months of usage with load shedding I can see it gets dim very quickly and does not last as long as it used to. Inside is a normal lead acid 6v 4ah battery. This battery is obviously not meant for repeated charging and discharging and I am looking for somethng to replace it with. I think a lithium battery may be the best option. Has anyone replaced the battery on these with a lithium battery and what has been your experience? Is the built in charger able to charge a lithium battery? Would an 18650 battery work here?

18650 will not work. They are 8.4V when 2 are fully charged. It seems a bit high. 

These will be more suitable but one would have to check what the max charger volts of the Magneto is.

Google for Elektromann 32650 battery.

 

 

Posted

No, you cannot use a Lithium battery with this lantern. The charging circuit is a resistor - you will kill the battery in no time. If you really want to do it, using a power bank is your safest bet (for charging, converting to 5V and switching off when the battery is empty). You will still require a way to limit the current to the LEDs - this lantern uses a resistor for lower levels and relies on the internal resistance of the battery for full power.

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