Both the Happymodel Mobula7 (review) and Eachine Trashcan (review) both come with 4 x 1s batteries that are designed to be used in series 2 at a time with a fiddly ph2.0 series connector. This introduces a lot of resistance in the power circuit and resultant voltage drop under load which shows as battery sag. It is easy to upgrade to a true 2s JST connector as I've shown in this blog or a XT30 if you'd prefer. Although 2s 300mah batteries are not expensive it does feel wasteful just leaving the old batteries to die. This article covers how to convert these or any other 1s cell into a 2s battery and is scaleable up to 6s!
This is the fifth article in my series of HappyModel Mobula7 upgrades, many of which can be used for the Trashcan too. Also to come are:
A Word of Warning
Lipo batteries - even these tiny ones - have a lot of power. Anytime you modify you run the risk of rapid discharge (shorting) which generates heat and possible worse. Only do this mod if you are confident around electronics. Please wear eye protection at a minimum and work in a well lit space. Just go buy the 2s batteries if you are unsure at any point.
As well as having a well lit area and a good soldering iron, solder and flux (see my article on budget tools here) you'll nee the following items:
If it makes it easier here is the wiring diagram. Discharge connector can be JST as I've used or XT30. Adapted from an image on this page
So that's it! I've done about 5 cycles in this battery so far and other than the slightly lower capactiy it flies just fine compared to a stock 2s battery. This is a great way to use up the otherwise sound orphaned 1s batteries you may have floating around.
Although you are likely to already have one, if these are genuinely your first multicelled batteries you will need a balance charger so that you can charge more than one cell at a time. Although they can ben expensive, a good charger will stay with you forever and they are a LOT more accurate than the chargers these quads come with which at best undercharge or at worst overchage your cells. My recommendation is the Hobbymade D6 pro duo charger. Without going into detail I've done a full review here.
See below for weight comparisons.
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