Canon Battery Charger

started 23rd July 2021

I once won an auction for a Canon Power Shot SD750 on ebay and it came without a battery charger. I bought one, and what I got was a fake CB-2LVE. It generated anxiety, from needing a "death o' dapter" for its non-UK plug, via the presence of AC mains on a dubious PCB (marked PXH662-A) to what it might be doing to the battery. But it did work, until the day it didn't. I got off lightly, it just stopped working without any smoke.

Looking on the web I found someone using a TP4056 battery charger break out board for the same Canon NB-4L battery. I could have 3D printed that design, but what appealed was to 3D print a piece of plastic that would allow a TP4056 board to fit in the existing charger case - I got to use the battery connector.

There is an excellent article about the TP4056 here.

In the original charger the black plastic containing the mains socket, which slots into the case, is used to support the PCB. I designed a 3D print which holds the TP4056 board in a similar way. Another print, which I glued in, is a block that holds a couple of 3 mm LEDs over the translucent plastic in the case.

The TP4056 board came with a resistor to give a charge current of 1 A (it is the one marked 122 i.e. 1.2 KΩ), I replaced it with a 5.1 KΩ resistor giving a charge current of 250 mA). The two on board LEDs were removed and wires run from their former locations to the new LEDs in the printed block.

Battery charger CB-2LVE, David PillingBattery charger CB-2LVE, David PillingBattery charger CB-2LVE, David PillingBattery charger PXH662-A, David PillingBattery charger PXH662-A, David PillingBattery charger PXH662-A, David Pilling
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Page last modified on July 26, 2021, at 11:37 AM
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