3D printing of a battery charger for Li-ion accumulator batteries

To make it easier the contact block was used from a the old device, all other parts will be different. There are the next tasks were set for the future device:

• To charge the accumulator battery by current 1.5 Amp up to voltage 12.6 VDC
• Indication of the state of charge
• Sockets to fix the unit at a surface

Trial model were also printed from PLA+, at the maximum printing speed (it is 100 mm/s for our SkyOne printer). The first configuration became too bulky and not handy. But the second attempt seems to be good enough. Of course there is something to improve again, but the time is precious and it is better to follow the principle of "as low as reasonably practicable".

One of improvements, which could be added, is fixing circuits by clicks (as much time was spent on looking for small screws).

The final case also was printed from P-Carbon plastic. All parts inside are placed compactly and conveniently.

It can be seen on the photo, that plus lead of the indicator is break. It is connected when the battery is set on. So the indicator will work only when the battery is inserted to the charger. The result came compact and handy. Here is the photo of an old charger - to compare.