cj4humanity:

I need 20000mah power bank

Your location?

For genuine powerbank, go for Romoss.
I have the following Romoss products.

solo5 10000mah #6000
pulse20 20000mah #8500
polymos20 20000mah #8500
pulse30 30000mah #13500

You can actually design it for less. I have got different lithium battery set-up, some on only solar, only grid, grid + solar. The one I use personally works on solar. If renewable, lithium battery is the way to go, I have been working with it for over 5 years.

For your rechargeable fan

Replace the lead acid battery with lithium ion / lithium polymer battery. The battery protection circuit in most of the rechargeable fans are poorly design which in no time kill the battery. To get optimum performance from the rechargeable fan replace it with lithium battery

Topmost11:
House what is the implication of replacing a 4.5ah battery with 7ah or 9ah aside longer run time? I have replaced the follow come battery of my new fan with 7ah battery. One of the reasons I opted for the fan make/model is the 12v battery rather than the 6v models.

One other thing, battery gurus and general house. Must a battery be always upside up or I can place it sideways. I ask because if I place the battery sideways, it will enter the battery slot/compartment of the fan and I will be able to replace the cover. See attached pictures.

Pix1 will ensure battery enters the slot and cover replaced but it will stand sideways and not upright. Pix2 is upright but battery will sit outside the battery slot.

Another question.
My bad 5yearold 100ah battery has been idle for months now. Before I stopped using it, it serves during sun hours but lasts 1.5hours after sundown. If I replace the follow come fan battery with it, what is the effect?
I am looking at two options
1: charge it with solar via cc once in maybe 5 days or as need arises.
2: allow fan to charge it during sun hours when inverter is on as the need arises.

Problem I envisage is with option 2. It means I shall be drawing from inverter to charge it thus my main 200ah battery will suffer it as it may not charge fully since the inverter will be pull load to charge the 100ah battery by way of the fan. Hence my resolve to charge only during sun hour. Pls attack the proposal and give suggestions for improvement . Thanks

ewizard1:

18650 cells or Laptop Batteries?

18650 Cells - You would have to order new cells from overseas which I think is almost difficult.

Laptop Batteries - Laptop engineers

it's the same 18650 cells that are in laptop battery. You can source them locally. You may buy used powerbanks / laptop battery packs.

@Luckyway

Kindly help with electrical past questions isahx04@gmail.com

Romoss powerbank is the only original powerbank in Nigeria.
I have been selling and using romoss since 2014. It comes with 1 year warranty (excluding physical damage). I have sold over 60 pieces with only 3 returned.

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I am interested
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, see u guys in unilag,