I've been in the game for a while and always thought its best to let batteries cool for before recharging them. Does anyone have other tips in making these batteries last and perform at their best?
Have you read the Intelligent Flight Battery Safety Guidelines from DJI? Lips hate the cold. Do not store them at less than normal room temps. Set to auto-discharge after a certain amount of days in the app if you leave them fully charged.
To not damage anything you must use a power supply with adjustable voltage set to the same as your original DJI charger, AND an adjustable current limit that you set to the maximum the battery is rated for (mandatory).i was wondering since the batts have their own electronics i (in theory) could not damage anything... or?
i wouldn't want to charge over 1C so for the big pack a max of 5A and for the smaller ones if would be able to get a power adaptor with 4700mhA output at still 100w would be good i think. it would still take down chargetime a bit. no??Good question. It's worth taking a look at the Inspire 1 tech specs on DJI's website. There they say that the max charging power for both batteries is 180W. As their charger outputs at 26.3 Volts, this implies that you can charge their batteries at up to 6.84 Amps. However, don't be fooled into thinking that would lead to a charge time of 33 minutes for the standard battery or 43 minutes for the larger one. Once the cells reach their maximum voltage, the current draw reduces until it reaches a minimum defined level that indicates a full charge. This is why the stock charger, rated at 100W, still takes 90 minutes to charge the standard 100Wh battery.
If you are able to configure a power supply to deliver 26.3V at 6.8A then I would estimate the charge time would drop to 45-50m for the standard battery. Perhaps an hour for the larger one.
In fact the standard charger will be charging the standard battery at 1C until the current drawn reduces towards the end of the cycle. If you stop charging after about 50 minutes to an hour you'll probably find you have reached 90% capacity.
So why don't DJI provide a 180W power supply to charge the batteries? IMHO they are also trying to optimize the number of charge cycles they can get from the battery before it drops to 80% health. I also think they don't want to exceed a 1C continuous charge rate for the same reason.
I strongly suspect that most people will never get anywhere close to cycling their batteries 2-300 times because they just won't get out and fly their drones often enough. I don't think that charging at 180W would shorten the battery's useful life significantly either. Therefore it's likely to have more to do with the increased cost of producing a higher output charger and dealing with the extra heat it would produce. Engineers like to err on the side of caution too.
I hope that helps.