Recently I made my biggest ever FPV purchase - the Fatshark attitude V5 FPV goggles with the new 30 degree FOV OLED screens. I'm still field testing these for a review which will follow but first I wanted to look at the battery case, more to the point, how to fix the shortcomings.
In this tutorial I rectify this issue by showing you how to safely open the case and mod it to allow for real balance charging whilst losing noe of the rest of the functionality. With this mode you do not need a special charger for 18650 cells, you can use your regular balance charger and charge your pack safely and efficiently. If you need batteries a local vape shop will probably have the best prices but if not then I used these 3000mah ones that have been rebranded.
See below how to complete the work. This took me about 30 minutes. Most of the time was to figure out the best path for the wire and make the path for it accordingly. As always, pictures can be embiggened
Now for the easy part - charging. Since you will already have a balance charger for your lipos, this is the ideal charging unit for it. Just make sure you select Li Ion as the cell type for charging which means charging is typically limited to 4.1v per cell. Unlike LiPo batteries you should charge at a maximum of 0.5C e.g. 1.5A for 3000mah batteries or 1A for 2000mah batteries etc.
Did it work?
Yep! Beautifully - just as I'd hoped. Charging went flawlessly - my 3000mah calls took 2600mah charging from 3.4v which sound about right. The battery indicator works perfectly too. Given the capacity of these batteries they will probably never come out of the case - I will just charge them up in the case as they get low. I honestly don't know why Fatshark don't do this from the factory but then again there are a number of curious design decisions which I'll comment on more in my goggle review.
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Coming soon: Fatshark Attitude v5 review and comparison to the Aomway Commanders