I finally got this new battery charger and is almost perfect. There are a similar ones from other brands, this is the Patona synchron (Germany based I think). - changing the "battery plate adapter" it can charge different type of batteries (one charger to rule them all!) - As input current it works with: USB (5v), Car power socket (12v), Wall socket (220v) - As output it charges the camera batteries(!) and also has an USB output so it doubles as a 220v -> USB adapter. - it's quite small and light (113 gr excluding cables) - Has a 0-100% backlit charging display - it works as a battery level tester even when completely disconnected from power sources - it costs about 22 euros My main problem was to find something that could charge batteries while off the grid. There are some chargers that accepts 12v input but this means to bring around a medium sized solar pack (like the GoalZero Nomad 7) and this works only while the sun is up or with big special 12v power packs. Even charging from a car/motorbike is not ideal as you have to remember to do it while on the move (ok, with a car you can do it during the night if you can safely leave the charger inside and you remember to do it before you get into bed). Having USB is much simpler as I can use a common power pack plugged during the night or while hiking. Yes, charging times are going to be slow but the capacity of camera batteries is not much so it's reasonable (I still have to test a full charge time). Here is a comparison with the E-M1 and E-M10 chargers. Overall size is not much different from the standard ones. What I would improve: - make it smaller - make it double sided so that it can charge two batteries while keeping the small size Or just make the damn camera charge the batteries through USB like some models (TG-4 for example) are already doing.