====== Зарядка аккумуляторов ======

Оптимальный ток зарядки аккумулятора определяется просто: он составляет 1/10 ёмкости аккумулятора (0.1 С). Т.е. если имеем аккумулятор ёмкостью 2000 мА/ч, то заряжать рекомендуется током 200 мА, если 2500 мА/ч, то, соответственно, оптимальный зарядный ток будет 250 мА и т.д. При ускоренной зарядке происходит нагрев (а иногда и перегрев) аккумуляторов, что приводит к ускоренному старению и уменьшению ёмкости.
Поэтому покупать имеет смысл зарядку, в которой каждый аккумулятор заряжается отдельно от других, а не в батарее, и имеется функция разряда не до конца разряженных аккумуляторов, чтобы минимизировать потерю ёмкости со временем.


===== Методы заряда аккумуляторов =====

Существующие методы заряда NiCd и NiMH аккумуляторов можно разделить на 4 основные группы:

  * медленный заряд -- заряд постоянным током величиной 0.1 С в течение примерно 15 часов или 0.2 С в течение 6-8 часов
  * быстрый заряд -- заряд постоянным током, равным 1/3 С в течение примерно 3-5 часов
  * ускоренный или дельта V заряд -- заряд с начальным током заряда, равным величине номинальной ёмкости аккумулятора, при котором постоянно измеряется напряжение на аккумулятора и заряд заканчивается после того, как аккумулятор полностью заряжен. Время заряда примерно час--полтора. 

Разделение это достаточно условно и зависит от фирмы-изготовителя аккумуляторов. Подход к вопросу о заряде аккумуляторов примерно такой: фирма разрабатывает различные типы аккумуляторов под различные применения и устанавливает для каждого типа рекомендации и требования по наиболее благоприятным методам заряда. В результате одинаковые по внешнему виду (размерам) аккумуляторы (одиночные элементы) могут потребовать применения различных методов заряда.

From [[https://lygte-info.dk/review/Review%20Charger%20SkyRC%20MC3000%20UK.html|Charger SkyRC MC3000]]:
<note>
**NiMH**

Be careful with charge current, using anything below 0.3C will probably miss termination on AA/AAA cells. I mostly use the setting around 0.5C.
To keep the cells safe if the terminations is missed use a capacity limit between 130% and 150% of the cells capacity and a timer cutoff calculated as ''capacity/current×1.4'', i.e. for a 2000mA cell at 1A it is 2000/1000*1.4 = 2.8 hours = 2 hours 48 minutes.
For NiMH the -dv/dt setting must be as low as possible, I used 3mV for my test, but a lower value might be even better. Too low value will not damage the cell, but might give early termination.
LSD cells do not need any trickle charge, for other cells a 10mA trickle charge can be used, but it not really needed either (some manufactures recommend a time limited trickle charge after a -dv/dt charge).

Official termination voltage for NiMH when discharging to measure capacity is 1 volt, but there is no problem going lower (like 0.8 volt).

With NiMH the cycle mode can be used to refresh cells that has been unused for some times.

**LiIon**

LiIon cannot really be over charged when the charger uses the correct voltage, but damage cells can do nasty things if the charger continues to charge them. Using the capacity and timer cut specification will reduce the risk of that.
Because LiIon do only need rated capacity when charged the safety limit can be place as low as 10% above the rating, but more is also acceptable. For 18650 I will be using 3600mAh and for 26650 7000mAh limits.
Time can be estimated as ''capacity/current+2'' hours, i.e. for a 3400mAh cell at 1A it is 3400/1000+2 = 5.4 hours or 5 hours and 40 minute. The extra hours added will depend on cell age and termination current, two hours will work in most cases.

When discharging using 3V as "cut volt" is always safe, for lower voltage it is best to check the datasheet, but a single discharge to a lower voltage without using the "D.REDUCE" option will probably be safe (I have never seen any problems in my tests).
</note>

From [[https://www.candlepowerforums.com/threads/skyrc-%E2%80%94-ifa-2014-%E2%80%94-mc3000-charger-analyzer.389700/post-5511869|SkyRC — IFA 2014 — MC3000 charger-analyzer]]
<note>
If you set Delta Peak=3mV you should use 0.5C as charging current (as stated by Panasonic). Alternatively (like I do) set Delta Peak=0dV and generally you can lower the charging current down to 0.3C. The MC3000 charger uses a constant current charging method (not pulsed) and it is quite critical regarding the detection of the end charging point.
</note>

  * [[http://aacycler.com/post/high-current-vs-low-current/|How do different charge/discharge rates affect the lifespan of NiMH batteries?]]
  * [[http://aacycler.com/post/discharge-cut-off-comparison/|How different discharge cut-off values determine the capacity and cycle count of NiMH batteries?]]
  * [[http://aacycler.com/post/charge-algorithm-comparison/|How different charge algorithms (negative delta, zero delta, voltage termination) determine the capacity and cycle count of NiMH batteries?]]
  * [[https://profpv.ru/parallelnaya-zaryadka-lipo-kak-zaryadit-s/|https://profpv.ru/parallelnaya-zaryadka-lipo-kak-zaryadit-s/]]


===== Время зарядки =====

<note>
Согласно [[http://www.powerbank.ru/p9.htm|этой памятке]], оптимальные ёмкости аккумуляторов для зарядки на GP Power Bank Universal (GPPB19) :

^ Тип	^ Ёмкость	^ Ток зарядки (мА)	^ Время зарядки (ч)	^
| AA	| 2600		| 260			| 16			|
| AAA	| 200		| 120			| 16			|

"C" is the rated capacity of the battery in amp-hours. The datasheet subscript "5" usually means the time period used by the manufacturer to calculate C, so read C<sub>5</sub> as "C over a 5 hour discharge time".

See also:
  * [[https://forum.sparkfun.com/viewtopic.php?t=23290#p107599|Sparkfun Battery Charge Current Question]]
  * [[http://www.picaxeforum.co.uk/showthread.php?16597-Max-Discharge-Current-2-0C5A#post148036|Max Discharge Current 2.0C5A?]]
  * [[http://www.large-battery.com/cycle-life-of-rechargeable-battery.html|Cycle Life of Rechargeable Battery]]
</note>


===== Charger =====

  * [[http://lygte-info.dk/info/roundCellChargerIndex%20Universal%20UK.html|All universal chargers]]
  * [[livejournal>ammo1/613095|Зарядное устройство JAPCELL BC-4001]] ([[https://www.nkon.nl/charger/japcell-bc-4001-charger.html|€29.95]])
  * [[habrahabr>164459|Умная зарядка Kweller X-1800. Заряжаем никель правильно]] -- рассказывает также о принципах зарядки аккумуляторов
  * [[http://www.lacrosse-nn.ru/%D0%B7%D0%B0%D1%80%D1%8F%D0%B4%D0%BD%D1%8B%D0%B5-%D1%83%D1%81%D1%82%D1%80%D0%BE%D0%B9%D1%81%D1%82%D0%B2%D0%B0/opus-bt-c3100-v2-2/|Обзор зарядки Opus BT-C3100 V2.2]] -- [[http://www.gearbest.com/chargers/pp_174044.html|€28.07]]
    * [[http://mysku.ru/blog/russia-stores/34124.html|Зарядное устройство Opus BT-C3100 V2.2 и его доработка]]
    * [[http://www.ebay.com/itm/BT-C3400-Battery-Charger-Analyzer-Tester-Li-ion-NiMH-NiCd-18650-Lithium-ion-V2-1-/331325504524|Opus BT-C3400 V3.1]] [[http://budgetlightforum.com/node/34663?page=1#post-1067989|is a rebranded Opus BT-C3100 v2.2]], [[youtube>Jpkok-zBgtk|Zeepin BT-C3100 v2.2 – это Opus BT-C3100 v2.2]], [[youtube>j3s5BCo8ea0|Floureon BT-C3100 – это Opus BT-C3100 v2.2]]
  * [[http://lygte-info.dk/review/Review%20Charger%20SkyRC%20MC3000%20UK.html|Charger SkyRC MC3000]] -- [[https://www.gearbest.com/chargers/pp_260894.html|€75.03]]
    * [[http://forum.fonarevka.ru/showthread.php?t=30314|Обзор SkyRC MC3000]]
    * [[youtube>QvZt_XnIzKA|Обзор SkyRC MC3000 и Opus BT - C3100 V2.2]]
    * [[youtube>ojjkFgjl1gs|SkyRC MC3000 Teardown – исправления и дополнения за прошедший год]]
    * [[youtube>l4i2znPVkfY|SkyRC MC3000 v2.2 весна 2018]]
    * [[youtube>QUhijW4noaQ|SkyRC MC3000. Сравнение версий 1.03 и 1.10]]
    * [[http://forum.ixbt.com/topic.cgi?id=20:31348:2306#2306|Мой пост на ixbt]], [[https://www.candlepowerforums.com/vb/showthread.php?389700-SkyRC-%97-IFA-2014-%97-MC3000-charger-analyzer/page167#post5166181|my post on candlepowerforums]]
  * [[http://lygte-info.dk/review/Review%20Charger%20LiitoKala%20Lii-500%20UK.html|Charger LiitoKala Engineer Lii-500]] -- [[https://www.gearbest.com/chargers/pp_228907.html|€21.18]]
  * [[http://lygte-info.dk/review/Review%20Charger%20GyrFalcon%20All-44%20UK.html|Charger GyrFalcon All-44 (Enova)]] -- [[https://www.gearbest.com/chargers/pp_554393.html|€30.01]]
  * [[https://www.skyrc.com/b6v2|SkyRC iMAX B6 V2]]
    * [[aliexpress>32815837275|SKYRC IMAX B6V2 charger (€31.47 / $36.11)]]
    * [[youtube>oM0uB8vlGAE|HTRC B6 V2, смотрим что внутри, как работает]] -- как подобрать блок питания (+12V для 3S, +18V для 4S), чтобы не поплавился штекер; +18.5V – это максимум, который допускает зарядка; DC→DC конвертер стабилизируется медленно от напряжения питания вниз :INFO:, напряжение скачет
    * [[https://habr.com/ru/company/dronk/blog/150213/|iMAX B6 — Универсальный зарядочный комбайн]] -- про подключение к PC через разъём термодатчика
    * <folded|Specification>
  * Charge: 60W / 6A max
  * Discharge current: 5W / 1A max
  * Balance current: 300mA max
  * Power supply: 12V 5A (11V-18V)
  * Battery types: LiPo / LiFe / Li-Ion / LiHV / NiMH / NiCd / Pb / DJI Mavic
  * DC/DC converter
  * :OPT: External thermistor (to be attached to the battery)
  
  :NO: Does not calculate/show the total power delivered to the battery
</folded>

  * ToolkitRC M6D 500W 15A
    * [[aliexpress>3256804137187379|ToolkitRC M6D 500W 15A DC dual channel mini smart charger (€57.09 / $58.60 or €78.11 / $80.19 with power supply)]]
    * <folded|Specification>
  * Input: 7-28V @30A max
  * Battery Type: LiPo / LiHV / LiFe / Lion @1-6S, NiMh @1-16S, Pb @1-10S
  * Balance current: 800mA
  * Charge/discharge: 0.1-15A / 250W on each channel
  * USB: 5V @2.1A (used to upgrade firmware)
  * Display: LCD IPS 2.4″ 320×240
  * Size: 98×68×35mm
  * Weight: 220g
</folded>

  * [[https://www.isdt.co/608pd.html|ISDT 608PD]]
    * [[https://oscarliang.com/isdt-608pd-charger/|ISDT 608PD review]]
    * [[aliexpress>1005006594052819|ISDT 608PD Balance Charger (€34.63 + €4 / $35.69 + $4.34)]]
    * [[youtube>eg-rde3DXQA?t=1061|ISDT 608PD voltage calibration]]
    * <folded|Specification>
  * Input: DC XT60 5-30V @10A (240W max), USB-C PD3.1 5-28V @5A (100W max)
  * Output: DC XT60 3-30V @0.5-10.0A (240W max)
  * Battery Type: LiFe / LiPo / LiHv (4.35-4.50V) 1-6S / Pb 1-12S / NiMH 1-16S
  * Balance current: 800mA
  * Display: 1.5″ IPS LCD
  * Size: 72.5×60×26.6mm
  * Weight: 85g
  * Working temperature: 0..40°C
</folded>

  * [[youtube>Kqa51Femytw|Current Probes / clamps / transducers (Измерение напряжения)]]


===== Battery specifications =====

{{ https://m.media-amazon.com/images/I/718CMd7gjEL._AC_SL1500_.jpg?200|Soshine 10440 LiFePO4 3.2V 280mAh}}
[[http://www.soshine.com.cn/upfile/20166/20160615121700888.pdf|LiFePO4 AAA (10440) Soshine specification]]:

  * Capacity (max/min): 280mAh / 200mAh
  * Charge: standard 50mA, rapid 500mA to 3.6V, 60mA cut-off
  * Max continuous discharge: 2A, 2.0V cut-off
  * Emergency current cut-off: 1A
  * Low resistant
  * Size: 10x44mm (DxH)
  * Weight: 7.5g
  * IR (measured): 220-260mΩ
  * [[http://club.dx.com/forums/forums.dx/threadid.1481651|My question on DealExtreme]], [[https://www.aliexpress.com/item/4-pieces-lot-Soshine-10440-battery-3-2V-280mAh-LiFePO4-Rechargeable-AAA-Battery-with-battery-protective/32254560350.html|AliExpress feedback reports 168mAh capacity]]

<folded|Devices>
  * 4 in all remotes (Sony TV IR remote + Pioneer remote + Kartina remote + Amazon Fire TV remote)
  * 1 in digital torque adapter
  * 1 in digital round kitchen scales
  * 1 in infrared thermometer Mestek IR01D
  * 1 not used
</folded>

[[https://www.amazon.nl/-/en/gp/product/B0882NDYRD|{{ https://m.media-amazon.com/images/I/618re379d5L._AC_SX679_.jpg?200|EBL 4× AA 1100mAh + 4× AAA 2800mAh}}]]

----

EBL AA 1100mAh + AAA 2800mAh:

{{ https://www.123accu.nl/images/products/group/AGP00103_1_big.jpg?200|GP ReCyko+ AA 2600 2300mAh}}
[[https://www.100peakpower.com/aa-rechargeable-2600-series-100-peakpower-nimh-batteries-pack-of-12|GP ReCyko+ AA 2600 2300mAh specification]] ([[https://international.gpbatteries.com/products/recyko-battery-2600-aa4|website]]):

  * Capacity (max/min): ~2300mAh

----

[[https://cellpacksolutions.co.uk/wp-content/uploads/2015/06/gp-batteries-gp270aahc-c4-technical-data-sheet.pdf|GP ReCyko+ AA 270AAHC 2600mAh specification]]:

  * Capacity (max/min): 2600mAh / 2500mAh
  * Charge:
    * standard: 0.1C<sub>16</sub> (250mA @16 hours)
    * rapid 2500mA with Δ0..5mV cut-off
  * Max continuous discharge: 7.5A, 0.9V cut-off
  * Nominal voltage: 1.2V
  * Size: 14.5x50.5mm (DxH)
  * Weight: 31.5g
  * IR: 18mΩ

<folded|Devices>
  * 5x2 = 10 -- thermostates
  * 2 in Natalia's trimmer
  * 2 in New Year lights
  * 6 not used
</folded>

----

GP ReCyko+ AAA 100AAAHC 950mAh specification:

  * Charge:
    * standard: 0.1C<sub>16</sub> (95mA @16 hours)

<folded|Devices>
  * 2 in remote control sticked to the wall for LED strips in kitchen
  * 2 in multimeter VC99
  * 2 in multimeter AN8009
  * 2 in lazer meter Lomvum LV77U
  * 2 in Madisana scales
</folded>

----

{{ https://m.media-amazon.com/images/I/71ABL-9DzyL._SX425_.jpg?250|Ultracell 400mAh 9V battery}}

Ultracell 400mAh 9V battery:

  * Charge: 15mA 14.40V (not from spec / measured at charger)

<folded|Devices>
  * 1 in metal detector Lomvum LW10
  * 1 in fire alarm on 2nd floor
  * 2 not used
</folded>

----

{{ https://www.openelectronics.eu/image/cache/catalog/elektronika/batteries-chargers/SKU0329-Akumuliatorius-Panasonic-NCR18650B-3400mAh-500x500.jpg?200|Panasonic NCR18650B LiIon}}
[[https://www.elumeen.com/media/wysiwyg/produits/Elumeen_panasonic_NCR-18650B_en.pdf|Panasonic NCR18650B LiIon specification]]:

  * Capacity (max/min): 3350mAh / 3250mAh
  * Charge: 1625mA 4.20V @4 hours
  * Max continuous discharge: 4.875A, 2.5V cut-off
  * Nominal voltage: 3.5V
  * Size: 18.5x65.3mm (D×H)
  * Weight: 48.5g
  * IR: <100mΩ

----

{{ https://portomart.net/wp-content/uploads/2021/04/Sony-VTC6-2_540x.jpg?200|Sony Murata US18650VTC6 LiIon}}
[[https://www.orbtronic.com/content/sony-VTC6-datasheet-specs.pdf|Sony Murata US18650VTC6 LiIon specification]]:

  * Capacity (max/min): 3120mAh / 3000mAh
  * Charge: 3A 4.20V @2.5 hours
  * Continuous/max discharge: 20A / 80A, 2.5V cut-off
  * Nominal voltage: 3.6V
  * Size: 18.45x65mm (D×H)
  * Weight: 47g
  * IR: 12.8mΩ
  * Price: €3.95 (2020-06-28)
  * [[https://lygte-info.dk/review/batteries2012/Sony%20US18650VTC6%203000mAh%20(Green)%20UK.html|Testing]]

----

{{ https://www.rebatt.nl/media/catalog/product/s/a/samsung-inr18650-35e-3_7v-550x550.png?200|Samsung INR18650-35E LiIon}}
[[https://lygte-info.dk/review/batteries2012/Samsung%20INR18650-35E%203500mAh%20(Pink)%20UK.html|Samsung INR18650-35E specification]]:

  * Capacity (max/min): 3450mAh / 3500mAh
  * Charge: 0.5C = 1700mA 4.2V, 0.02C (68mA) cut-off
  * Continuous/max discharge: 8A / 13A, 2.65V cut-off
  * Nominal voltage: 3.6-3.7V
  * Size: 18.55x65.25mm (D×H)
  * Weight: 48g
  * IR: <35mΩ
  * Price: €3.45 (2022-07-04)

----

{{ https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQt_qcnbrDV_ZeM_s4buCRNq5o0nnQdWJiu-MvrMCovUQ&s?.jpg?200|LG INR18650-MJ1 LiIon}}
[[https://www.nkon.nl/sk/k/Specification%20INR18650MJ1%2022.08.2014.pdf|LG INR18650-MJ1 specification]]:

  * Capacity (max/min): 3400mAh / 3500mAh
  * Charge: 0.5C = 1700mA 4.2V, 50mA cut-off
  * Continuous/max discharge: 680mA / 10A, 2.5V cut-off
  * Nominal voltage: 3.635V
  * Size: 18.4x65mm (D×H)
  * Weight: 49g
  * IR: <40mΩ
  * Price: €3.69 (2024-03-21)

----

{{ https://countycomm.com/cdn/shop/products/ScreenShot2021-09-20at10.45.46AM.png?200|Molicel INR-21700-P42A LiIon}}
[[https://www.molicel.com/wp-content/uploads/INR21700P42A-V4-80092.pdf|Molicel INR-21700-P42A specification]]:

  * Capacity (max/min): 4200mAh / 4000mAh
  * Charge: 1C = 4.2A 4.2V
  * Max discharge: 45A, 2.5V cut-off
  * Nominal voltage: 3.6V
  * Size: 21.7x70.2mm (D×H)
  * Weight: 70g
  * IR: <16mΩ
  * Price: €4.55 (2024-03-21)

----

{{ https://m.media-amazon.com/images/I/71GpXDpWy8L._AC_SL1500_.jpg?150|LI-10B LiIon 3.7V 1050mAh}}
[[https://docs.rs-online.com/6dc9/0900766b805ae543.pdf|LI-10B LiIon 3.7V 1050mAh]]:

  * Capacity: 1050mAh
  * Charge: 525mA for 3.5h min
  * Discharge: 210mA to 2.75V (discharge with 0.3A takes 02:46)

----

{{ https://ae01.alicdn.com/kf/H286e80170554430bb311fae21e767c206.jpg?200|Zeee 4S 14.8V 1500mAh 100C LiPo}}
[[aliexpress>33030893106|Zeee 4S 14.8V 1500mAh 100C LiPo battery]]:

  * Capacity: 1500mAh
  * Voltage: 14.8V
  * Configuration: 4S1P
  * Discharge rate: 100C
  * Charge rate: 0.5C..1C
  * Connector type: XT60
  * Balancer connector type: JST-XH
  * Dimensions (W×D×H): 35×33×67mm
  * Weight: 168g
  * To store for a long time, discharge the battery to 50% (3.8V per cell)
  * Never store the battery fully charged, the performance will degrade noticeably

----

{{ https://ae01.alicdn.com/kf/H56c1b1e0478a4aa08842a20a2b79c836a.jpg?200|3.7V 4000mAh LiPo}}
[[aliexpress>4000935250294|124065 3.7V 4000mAh LiPo battery]]:

  * Voltage: 3.7V
  * Discharge rate: 1C
  * Fast charging: 1C
  * Standard charging: 0.5C CC to 4.25V, then CV till charge current is less than or equal to 0.05C
  * Termination current: 0.05C
  * Discharge cut-off voltage: 2.75V
  * Dimensions (H×W×L): 12×40×65mm

  * 2021-06-16: SkyRC: LiIon 3764mAh
  * 2021-11-30: iMax: LiIon 0.5A: 879mAh


===== Links =====

  * [[http://best18650battery.com/|Best 18650 Battery]] ({{best18650battery.com.pdf|local copy}})
  * [[https://batteryuniversity.com/learn/|Articles about batteries]]

  * [[http://www.batteryshowdown.com/index.html|Alkaline, lithium and zinc-chloride cells test]] to find the best AA batteries you can buy for your money
  * [[http://www.lygte-info.dk/|Testing batteries, chargers and flashlights]]
    * :INFO: [[http://lygte-info.dk/info/BatteriesRidiculousRatings%20UK.html|Batteries with ridiculous ratings]]
  * [[https://mysku.ru/search/topics?q=18650|Тесты аккумуляторов 18650]]
  * [[youtube>oZCZd4Zaiuw|Аккумуляторы для дронов: как и какие использовать? сколько "живёт" аккумулятор?]]
  * [[https://batterybro.com/pages/18650-date-code-lookup-tool|Date Code Lookup Tool]]
  * [[livejournal>ammo1/460300|Большое тестирование батареек]]
  * [[livejournal>ammo1/573394|Грандиозное тестирование батареек]]
  * [[livejournal>ammo1/585236|Ёмкость аккумуляторов в mAh и Wh]]
  * [[livejournal>ammo1/564015|Как отличаются по ёмкости батарейки разных типов - щелочные, солевые и литиевые]] ([[livejournal>ammo1/566368|продолжение]])
  * [[livejournal>ammo1/559971|Батарейки и мороз]] -- хранение на морозе почти не вредит щелочным батарейкам, за год хранения ёмкость щелочных батареек не уменьшается
  * [[livejournal>ammo1/591146|Тестирование аккумуляторов: первые выводы]] ([[livejournal>ammo1/585774|От батареек к аккумуляторам]])
  * [[youtube>iScKCOH3eqA|Harvesting 18650 Li-ion battery from old laptop battery pack]]
  * [[http://www.candlepowerforums.com/vb/showthread.php?414090-Testing-smartphone-batteries|Testing smartphone batteries]]
  * [[youtube>q2o3Wc-0fVk|How to test if 18650 cells are fakes]]
  * [[https://batterybro.com/blogs/18650-wholesale-battery-reviews/30828867-is-it-a-fake-18650-battery-featuring-the-samsung-25r|Is it a fake 18650 battery?]]
  
  * [[http://budgetlightforum.com/comment/1336338#comment-1336338|Which one is the real LittoKala store]] ([[http://budgetlightforum.com/comment/1413707#comment-1413707|#575]])?
    * :NO: Fake from [[https://liitokala.aliexpress.com/store/133859|LiitoKala Official Flagship Store]]: [[http://budgetlightforum.com/comment/1334930#comment-1334930|#142]]
    * :NO: Fake from [[https://liitokala0fficial.aliexpress.com/store/725333|Liitokala Factory Store]]: [[http://budgetlightforum.com/comment/1336340#comment-1336340|#204]], [[http://budgetlightforum.com/comment/1341725#comment-1341725|#283]], [[http://budgetlightforum.com/comment/1354400#comment-1354400|#377]], [[http://budgetlightforum.com/comment/1424984#comment-1424984|#595]]
    * :NO: Fake from [[https://liitokalahongkong.aliexpress.com/store/217753|Liitokala Official Store]]: [[http://budgetlightforum.com/comment/1346875#comment-1346875|#346]], [[http://budgetlightforum.com/comment/1362482#comment-1362482|#412]], [[http://budgetlightforum.com/comment/1372809#comment-1372809|#453]], [[http://budgetlightforum.com/comment/1386507#comment-1386507|#460]] \\
      :YES: Good: [[http://budgetlightforum.com/comment/1324427#comment-1324427|#49]], [[http://budgetlightforum.com/comment/1354557#comment-1354557|#384]]
    * Recommended: [[https://www.aliexpress.com/store/1270703|GlobalPower Co.]], [[https://queenbattery.aliexpress.com/store/1332380|QueenBattery]], [[http://www.aliexpress.com/store/1159776|EAIEP]], [[https://www.aliexpress.com/store/1382210|Aliya's Battery Store]], [[https://www.aliexpress.com/store/1191644|Lucky Electronics]]

[[wp>List of battery sizes]] from which most popular are:

  * [[wp>CR2032 battery|CR2032]] ([[sunsky>219321|sunsky]])
  * [[wp>LR44 battery|AG13]] ([[sunsky>219300|sunsky]])
  * For D-size battery use [[http://www.ebay.com/sch/i.html?_nkw=D+Size+Battery+Converter+Adapter|D Size Battery Converter]] (for two AA accumulators).