- User Since
- Sep 3 2017, 3:48 AM (111 w, 3 d)
May 5 2018
It looks really cool!
Jan 4 2018
This is the first sketch of the pcb that i made. it's 18x72mm, to fit atop of 4 18650 cells.
Dec 19 2017
Dec 14 2017
Nov 6 2017
spring loaded individual 18650 cells. would that be an option to avoid DIY and legal issues? is it secure enough without soldering?
Nov 4 2017
is it possible to cover a smaller battery (8 cells) and big (16cells) with the same electronic design?
Yes and no. The way i throught the design was in modules of 4 cells.
Using 4 cells with a single pcb on top, forming a unit of battery.
This unit can be stacked to form the size of battery you want, in 4, 8, 12, 16 cells and so.
Oct 28 2017
:O it's not open source!
I finally made the Eagle work on my computer, i have to say, is almost unusable compared to older version of Eagle.
Oct 5 2017
Here's the charger. It's basic but it should work more than fine with protected batteries.
Sep 28 2017
It looks awesome! i like that you leave the connections on the sides.
Sep 26 2017
I research the ATmega8HVA and is seem to be "self programming" meaning that a test bench is needed to charaterize each type of cell and program the IC.
Sep 25 2017
Laptop batteries don't actually do that, they have something that is almost planned obsolecence. For example, Dell uses a microcontroller that counts cycles anr/or usage hours, but not for each charger, they count the entire life of the cells as a whole (all of them in the pack). When a certain prefix limit is reach, the micro tells the computer, and the computer refuses to charger the battery.
So is a "safe life" protection. The battery may be fine, but because they want to avoid a lawsuit if something happens they just block the battery after a a few cycles/hours.
Well, you can make a led status without a PIC or any microcontroller. we could desing a status around a vumeter IC, like the LM3915., with the press of a button it will tell you the state of charge.
The advantage of an analog state will be 0 current drain. Because you only read the battery when you press the button.
Sep 24 2017
I Sacrifice my very own japanese sony charger from 1997. Is still working properly so i think is a design to look for.
Sep 21 2017
I corrected the schematic of the Battery Protection, i should be like this. Also aldd a 3 pin connector to allow the use of a charger/balancer
Sep 12 2017
What would be better:
A- A CHarger with the balancer incorpored and a battery with only low voltage protection
B- A more simple charger and batteries with their own low voltage protection and balancer.
Sep 4 2017
Yes, it won't be very hard to design our own battery pack for the Axiom.
Here i made a Low Voltage protection. It will cut at 6V, (3V per cell) and it can be added to each Sony NP-F in case it's necesary.
Sep 3 2017
Sony's NP-F batteries do have their own protection inside the battery. I disassemble one to check. This one in particular has two 18650 from panasonic, and it was built in 1997. This batteries are still being produced 20 years later and used in modern cameras like the FS700. So i think is a good route to build the battery system.
The camera could have a universal power conector to change between different battery plates, so other baterries could be adapted as well. Like RED does with their cameras.
Even an ATX power supply connector could do the job.