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  • 16/02/2017

    Pros: - Battery level meter - On/off button - USB connector Cons: - With some bike light it can flicker - Not so good water resistant (rubber ring needs to replace)

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  • 23/05/2016

    This is a great idea for packing 4 x 18650 batteries to create a battery pack. Very useful for providing autonomous power to a bike light, for examp Cons: 1) Not waterproof. There is a rubber-like seal but it is not thick enough to provide reliable watertightness. A round opening with an O ring would likely have been necessary to ensure proper protection against water. So the BC-02 would be practically useful in rain. 2) The USB connector which allows it to serve as a power pack for cellphones, etc. may partially compromise its use as a bike light battery pack. It presents one more thing to worry about in the rain. Conclusion: It may make more sense to buy a ready-made welded battery pack made from quality 18650 batteries such as Panasonic. It might even be cheaper than buying batteries and case separately.

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  • 14/12/2016

    Отправили на 4 день. Приехал всего за 8 дней, это рекорд для недорогих посылок. USB порт отлично держит 2А (проверял на резисторе), просадка напряжения небольшая. Герметичность пока не проверял.

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  • 19/06/2019

    produto chegou antes do prazo...mas não veio as pilhas ?

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  • 16/01/2021

    Bom item

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  • 19/10/2020

    produto OK

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  • 28/04/2015

    Покупал в первую очередь для велофары, результат лучше ожиданий: с хорошими 18650 аккумуляторами (2600 мАч) фара светит почти в два раза дольше чем с той аккумуляторной сборкой, что шла в комплекте к фаре. Так же радует, что можно менять аккумуляторы, когда те разрядятся, а севшие потом спокойно отдельно зарядить. Ну и в случае чего безболезненно для работоспособности извлечь два аккумулятора из 4х (все работает и на 2х аккумуляторах, очевидно при этом что время работы фары уменьшается). Есть индикатор заряда аккумуляторов, не слишком информативный (всего 3 диода) но лучше чем ничего. Приятным бонусом стало и то, что USB выход выдает до полутора ампера (может и больше, мой телефон больше просто не потребляет даже при севшем аккумуляторе). Теперь как никак а в вело поездке с собой еще один дополнительный источник энергии для телефона. В общем рекомендую: этот блок под аккумы, четыре хороших аккумулятора, и у вас появляется отличная аккумуляторная сборка для фары с функциями Power Bank. Что касается доставки: посылка пришла менее чем за месяц, что тоже, в общем то, неплохо.

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  • 06/03/2015

    Very good build quality and electronics, the USB output voltage (unloaded 5v) dropped slightly to about 4.5v at around 1.9A load when i tested it, the 5.5mm socket is permanently powered and the usb output is powered by the switch, which also shows state of charge by 3 tiny green leds which are permanently lit when the usb is powered on. The top fits the holder well and a decent quality o-ring seals the unit from moisture ingress, although it wont provide full waterproof safety it is rated ipx4 (which shouldnt be expected due to the 2 power outputs anyway). The output cable is approximately 60cm (2 feet) long and the cable splits to both outputs at around 30cm (1 foot), the dc jack socket has a moulded thread to secure certain bike lights plugs in place, although my bike light doesn't have the threaded cap it doesn't impede the plug and socket mating. The body houses two moulded loops for attaching it to frames with the supplied high quality velcro strap and the plastic is substantially thick enough not to break easily, the thumb screw is large enough to grip well to open or close the unit. I have not tested the units charging ability as I slotted in 4 freshly charged cells although the unit does have a sticker on the bottom giving details of the Over / Under charge protection voltages and over discharge current (9A!). overall rating 5* and BangGoods speedy shipping got it to me in the UK in <2 weeks.

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  • 04/05/2017

    I got the replacement unit today. have to say it's brilliant. Would recommend it to anyone who is looking for a unit to charge his 18650's, use it as a powerbank or hook up a bike light. Next test will be to use it as intermediate between a solar panel and a phone. Anyway, definately worth the hassle, eventhough I got a broken unit at first, banggood service is great they replaced it right away. You guys rock. I'll use banggood anytime before even looking at ali, the extra cost is so worth it when it comes to reliable service.

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  • 03/06/2016

    Good case. Had to modify the case because of the bottom contacts only one side was working. Used four fully charged 18650 batteries for one hour check volts after use and two were at 3.86 and the other two were still at the same charges volts of 4.17. Fixed with new contact metal bases and a wire to connect both metal bases together. Now all batteries after use have the same volts reading, Perfect fix.

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