Instructables

DIY Rechargeable Lantern LED Flashlight Conversion

Picture of DIY Rechargeable Lantern LED Flashlight Conversion

I wanted a good rechargeable LED flashlight, that would combine long battery life, and a very bright output. I could have bought one, but where is the fun in that?

UPDATE! Most Store bought LED Flashlights do not work well with rechargeable batteries, as the typical rechargeable (NiCd / NiMH) is 1.2v instead of 1.5v, causing dim lighting even when fully charged. This Project uses a constant brightness bulb, so no dimming. When battery voltage drops too low, light goes out.



I started with a $3 lantern flashlight from Walmart, installed a 1 watt replacement LED, a 4 D cell carrier, and 4 NiMH 10ah batteries. I have gone a full year of regular use, and just swapped the batteries for another charged set, and put the old batteries in the charger for next year.

Here is the original post - http://www.green-trust.org/wordpress/?s=lantern

Lantern Flashlight - $7
1 Watt LED replacement bulb (constant brightness) - $16 (never have to change this)
4 D Cell Adapter - $3.50 (Walmart - http://goo.gl/dmjw4R)

10ah NiMh D Cell (x4) - $5.20 each

Tenergy Advanced Universal Charger TN190-4 Channel AA/AAA/C/D/9V Ni-MH Charger with LCD Display and USB Power Outlet - $30 (smart charger, solar and auto ready)

 
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Step 1: Lantern Body

Picture of Lantern Body
Pretty much any 6v Lantern Flashlight will work. From the Cheap $3 units from walmart, up to the heavier and more durable $10-$15 units From Eveready and Rayovac.

There's no prep work, except to remove the battery if it's installed, and the existing light bulb. Keep any small parts that hold the bulb in place.

Step 2: The LED

Picture of The LED
The unit we have chosen is a multi voltage 1 watt LED, which is voltage and current regulated, so Brightness does not change until the batteries are completely empty, then it flickers out. Turning the light off allows a bit of recovery on the battery, so you can use it for brief periods while looking for your back up set of batteries. Remove the existing light bulb, insert the new LED, and prepare for battery install.


astral_mage11 months ago

why cant i do a copy an search on the first line of text?

astral_mage11 months ago

have u been to club.dx.com . they have a u.s. based warehouse to ship many item that your looking 4 to your house.