Batteries - Revision history

Kopaz: /* Where NOT to buy */

2023-11-15T02:29:50Z

Where NOT to buy

← Older revision		Revision as of 02:29, 15 November 2023
Line 53:		Line 53:
	1. All batteries available on large e-commerce websites (i.e. Amazon, Ebay, Aliexpress, Alibaba, etc).		1. All batteries available on large e-commerce websites (i.e. Amazon, Ebay, Aliexpress, Alibaba, etc).

	These websites are filled with low-quality battery manufacturers & drop sellers that wants to maximize cost. a typical ebike battery starts around $400USD, give or take.		These websites are filled with low-quality battery manufacturers & drop sellers that wants to maximize cost. a typical ebike battery starts around $400USD, give or take. They often take 10~20% on listing/maintenance fee (excluding taxes), so you can kinda see what kind of raw cost we're dealing with here.

	2. Unit Pack Power		2. Unit Pack Power
Line 64:		Line 64:

	Remember, a good ethical manufacturer will give you at minimum, what cells they are using & reasonable margin for continuous current/peak current of the cells.		Remember, a good ethical manufacturer will give you at minimum, what cells they are using & reasonable margin for continuous current/peak current of the cells.



	==Reputable Cell Providers==		==Reputable Cell Providers==

Kopaz: Where not to buy (aka, blacklist) added. Please discuss if I should remove btrpower.

2023-11-15T02:24:22Z

Where not to buy (aka, blacklist) added. Please discuss if I should remove btrpower.

@@ Line 49: / Line 49: @@
 [https://www.affordableebikes.ca/ Affordable E-bikes.ca] - Sells/ships batteries from Canada.
-Unit Pack Power used to be on our list, but due to several recently raised safety concerns and a couple of known fires, we no longer recommend this seller
+==Where NOT to buy==
 ==Reputable Cell Providers==

Kopaz: Warnings added on BMS bypass "methods" to fix batteries.

2023-11-01T22:32:46Z

Warnings added on BMS bypass "methods" to fix batteries.

← Older revision		Revision as of 22:32, 1 November 2023
Line 1:		Line 1:
	It is very important to only buy high quality lithium ion batteries. Improperly build battery packs can lead to catastrophic fires resulting in loss of property and life.		It is very important to only buy high quality lithium ion batteries. Improperly build battery packs can lead to catastrophic fires resulting in loss of property and life.

	Lithium-ion batteries can combust when improperly charged or discharged and can't be extinguished by water. as such there are only a few retailers we are willing to endorse. Its highly recommended to go with these resellers or at least do serious research on who you plan to buy packs from. Do not buy battery packs off random ebay/amazon/aliexpress pages, their quality often leaves much to be desired.		Lithium-ion batteries can combust when improperly charged or discharged and can't be extinguished by water. as such there are only a few retailers we are willing to endorse. Its highly recommended to go with these resellers or at least do serious research on who you plan to buy packs from. Do not buy battery packs off random ebay/amazon/aliexpress pages, their quality often leaves much to be desired.

			'''DO NOT bypass BMS to "fix" a battery! BMS is usually the last-line of defense for safety and overriding will have serious consequences, like overcharging cells risking fire & injury.''' If batteries don't charge, it doesn't charge for a reason. forcing charge into it will have serious consequences.

	==Common battery pack formulas==		==Common battery pack formulas==

Kopaz: /* Battery Troubleshooting */

2023-10-24T00:40:18Z

Battery Troubleshooting

← Older revision		Revision as of 00:40, 24 October 2023
Line 73:		Line 73:

	Disclaimer: The above quiz is not meant to be a certification and should only be used for educational purposes only. The test mostly covers about cylindrical cell formats, as they are most common type of cells used in E-bike batteries.		Disclaimer: The above quiz is not meant to be a certification and should only be used for educational purposes only. The test mostly covers about cylindrical cell formats, as they are most common type of cells used in E-bike batteries.

	Questions/Concerns/Comments of that quiz should be forwarded to Kopaz at [https://discord.gg/wawDk8xzzQ E-bike discord server].		Questions/Concerns/Comments of that quiz should be forwarded to Kopaz at [https://discord.gg/wawDk8xzzQ E-bike discord server].

Kopaz: Battery troubleshooting, link to quiz.

2023-10-24T00:39:20Z

Battery troubleshooting, link to quiz.

← Older revision		Revision as of 00:39, 24 October 2023
Line 67:		Line 67:
	Generally, you should strive for 20~80% SOC for charge-discharge cycle, but if you want to further lengthen cell lifespan, you can charge-discharge on a narrower SOC range, but this has diminishing returns (compared to 0%-100% to 20~80%).		Generally, you should strive for 20~80% SOC for charge-discharge cycle, but if you want to further lengthen cell lifespan, you can charge-discharge on a narrower SOC range, but this has diminishing returns (compared to 0%-100% to 20~80%).
	[https://www.nrel.gov/transportation/battery-lifespan.html Further read/Reference]		[https://www.nrel.gov/transportation/battery-lifespan.html Further read/Reference]


			==Battery Troubleshooting==
			[https://docs.google.com/forms/d/e/1FAIpQLSd-Jee1HL-Nlk5ZMCbuMsobD1qEIL67Lgq1BAB8IZPk3SZLIQ/viewform This test will give you most basic knowledge & potential issues encountered when self-servicing battery.]

			Disclaimer: The above quiz is not meant to be a certification and should only be used for educational purposes only. The test mostly covers about cylindrical cell formats, as they are most common type of cells used in E-bike batteries.
			Questions/Concerns/Comments of that quiz should be forwarded to Kopaz at [https://discord.gg/wawDk8xzzQ E-bike discord server].

Kopaz: /* Cell Lifespan */

2023-10-16T01:47:57Z

Cell Lifespan

← Older revision		Revision as of 01:47, 16 October 2023
Line 64:		Line 64:
	==Cell Lifespan==		==Cell Lifespan==
	Use cells to their rated-C, do not overheat them. Some heat is inevitable/preferred even, because batteries' IR generally increase as cell temperature drops. There's a whole control method to proper temperature balance of cells.		Use cells to their rated-C, do not overheat them. Some heat is inevitable/preferred even, because batteries' IR generally increase as cell temperature drops. There's a whole control method to proper temperature balance of cells.

	Generally, you should strive for 20~80% SOC for charge-discharge cycle, but if you want to further lengthen cell lifespan, you can charge-discharge on a narrower SOC range, but this has diminishing returns (compared to 0%-100% to 20~80%).		Generally, you should strive for 20~80% SOC for charge-discharge cycle, but if you want to further lengthen cell lifespan, you can charge-discharge on a narrower SOC range, but this has diminishing returns (compared to 0%-100% to 20~80%).
	[https://www.nrel.gov/transportation/battery-lifespan.html Further read/Reference]		[https://www.nrel.gov/transportation/battery-lifespan.html Further read/Reference]

Kopaz: Cell lifespan read added

2023-10-16T01:46:44Z

Cell lifespan read added

← Older revision		Revision as of 01:46, 16 October 2023
Line 61:		Line 61:

	Finding a quality case that meets your needs can be challenging; [[DIY-case]] can help you with designing one.		Finding a quality case that meets your needs can be challenging; [[DIY-case]] can help you with designing one.

			==Cell Lifespan==
			Use cells to their rated-C, do not overheat them. Some heat is inevitable/preferred even, because batteries' IR generally increase as cell temperature drops. There's a whole control method to proper temperature balance of cells.
			Generally, you should strive for 20~80% SOC for charge-discharge cycle, but if you want to further lengthen cell lifespan, you can charge-discharge on a narrower SOC range, but this has diminishing returns (compared to 0%-100% to 20~80%).
			[https://www.nrel.gov/transportation/battery-lifespan.html Further read/Reference]

Kopaz: /* DIY battery packs */

2023-10-11T18:47:55Z

DIY battery packs

← Older revision		Revision as of 18:47, 11 October 2023
Line 59:		Line 59:
	==DIY battery packs==		==DIY battery packs==
	If you cannot find battery packs that satisfy your needs, or you want to make/design on your own, [[DIY-battery]] can help you get started.		If you cannot find battery packs that satisfy your needs, or you want to make/design on your own, [[DIY-battery]] can help you get started.

			Finding a quality case that meets your needs can be challenging; [[DIY-case]] can help you with designing one.

Kopaz at 18:37, 11 October 2023

2023-10-11T18:37:51Z

← Older revision		Revision as of 18:37, 11 October 2023
Line 56:		Line 56:

	[https://www.imrbatteries.com/ IMRBatteries]		[https://www.imrbatteries.com/ IMRBatteries]

			==DIY battery packs==
			If you cannot find battery packs that satisfy your needs, or you want to make/design on your own, [[DIY-battery]] can help you get started.

Kopaz: /* Where to buy: */ Affordable ebikesdotca added to where to buy link.

2023-10-06T22:20:36Z

Where to buy:: Affordable ebikesdotca added to where to buy link.

← Older revision		Revision as of 22:20, 6 October 2023
Line 43:		Line 43:
	[https://em3ev.com/ EM3ev] - High quality hand-made batteries shipped from China. Comes equipped with a bluetooth compatible BMS so you can monitor your batteries health and performance with a cellphone app. Highly recommended.		[https://em3ev.com/ EM3ev] - High quality hand-made batteries shipped from China. Comes equipped with a bluetooth compatible BMS so you can monitor your batteries health and performance with a cellphone app. Highly recommended.

	[https://lunacycle.com/18650-ebike-battery-pack/ Luna Cycle] - ~~high~~ quality batteries shipped from USA		[https://lunacycle.com/18650-ebike-battery-pack/ Luna Cycle] - High quality batteries shipped from USA

			[https://www.affordableebikes.ca/ Affordable E-bikes.ca] - Sells/ships batteries from Canada.

	Unit Pack Power used to be on our list, but due to several recently raised safety concerns and a couple of known fires, we no longer recommend this seller		Unit Pack Power used to be on our list, but due to several recently raised safety concerns and a couple of known fires, we no longer recommend this seller