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I sometimes need 10kmah and sometimes 20kmah and would prefer not buy 2 separate battery packs. Money is no object. Is there a cell phone USB charger that is chainable?

  • What do you mean, chainable? Also, what is kmah? – Alex Nov 11 '18 at 0:39
  • @Alex I can hook multiple battery packs together and 1,000 mah. – William Nov 11 '18 at 0:41
  • Which device would you need these for? I think chainable battery packs are device-specific. Also, mAh = milliAmpere hours. So 1000 mAh = 1Ah. – Alex Nov 11 '18 at 0:45
  • @Alex "Is there a cell phone USB charger that is chainable?" – William Nov 11 '18 at 0:50
  • Is there a reason the SE posts linked on your profile have been removed by you, but remain in your profile? – Alex Nov 11 '18 at 2:05
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If I understood you correctly, a "cell phone USB charger" is a power bank. If that's right, then as far as I am aware, you have two options:

  • Buy a 20Ah charger that has multiple batteries inside, wired in parallel. When you need 10Ah, take out half the batteries; when you need 20Ah, put them back in. Example: 4 batteries inside. 3 batteries inside. 8 batteries inside (but you must take out 4 at a time).

  • Buy two 10Ah power banks, and a two-to-one USB cable, which would allow to use both of them at the same time if that's what you need. You can put them both in a single case, to make sure they stay as a unit. Using both simultaneously is particularly useful if your device uses a lot of power.

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  • Can I keep chaining those battery packs together with the splitters? – William Nov 11 '18 at 11:25
  • Theoretically, yes; in practice, though, every time you have a connection, you lose a certain amount of Voltage; and therefore, you would want to avoid having more than 2 connections before your charging device. The other problem is, that female-to-multimale connectors are quite rare; so the most you can do is 4-to-1 using this method, using three cables. Anything more, and you'd have to solder the cable yourself. Link for cheapest 3 cables: ebay.com/itm/… – Alex Nov 11 '18 at 12:55

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