9V LiPo Sale: $7.29 thru 7/9

ercoerco Posts: 18,499
I'm ordering a second one of these since they're on sale, free ship from Banggood. Nice unit, has a USB micro charge jack built in, red charge LED on the bottom (red=charging, off=charged). I tested one already: 9.5V out and honest 350 mAH capacity. Claims 400mAH, so pretty close. Obviously good for any legit 9V battery application, but I plan to use this on a mini robot using a HW Board. Grab one before the price goes back up to $10! https://www.banggood.com/ZNTER-S19-9V-400mAh-USB-Rechargeable-9V-Lipo-Battery-p-1070703.html

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"When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

- Pablo Picasso

Comments

  • 4 Comments sorted by Date Added Votes
  • Sweet. Are these always on?

    I dislike the auto-off circuits very much, unless it's because of low pack voltage. These would have been nice when I had a room full of people using HomeWork boards!
  • WhitWhit Posts: 3,720
    Great deal!
    Whit+

    "We keep moving forward, opening new doors, and doing new things, because we're curious and curiosity keeps leading us down new paths." - Walt Disney
  • How do these handle high current draw? Is the short circuit protection finicky?
  • ercoerco Posts: 18,499
    edited July 8 Vote Up0Vote Down
    xanadu wrote: »
    Sweet. Are these always on?

    Yes, always on, meaning there is some self-discharge, but I haven't determined how much. Package says to charge after 3 months of non-use.
    Seairth wrote: »
    How do these handle high current draw? Is the short circuit protection finicky?

    Obviously at just 350 mAH capacity they aren't good for very much for very long. Package says "built-in protection circuit will halt in case of overcharging, over-discharging, short circuit. Please recharge the battery again to recharge it."

    Here's my quickie bench test. I hooked it up to a high-power motor and it popped the internal circuit (breaker) immediately. Didn't get a current reading. It did reset when I charged it for a few seconds (PHEW!). Then I put a smaller motor on (100 mA) and it ran fine. I slowly increased the load up to 800 mA and held it there for ~5 seconds and it never stopped. Not too shabby IMO.



    "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso
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