20V battery - Page 1
Forum section: electronics / general

author: Chipson
author_rank: Newbie
timestamp: December 27, 2022, 03:05:23 pm
content: How much amperage/wattage does produce these batterie?inside is MH46259 5X 3.7v 1500mah batteries...

author: tunk
author_rank: Super Contributor
timestamp: December 27, 2022, 03:52:36 pm
content: If it's for a power tool, it may be 20-30A.

author: Thunderer
author_rank: Regular Contributor
timestamp: December 27, 2022, 05:48:08 pm
content: Quote from: tunk on December 27, 2022, 03:52:36 pmI do not know how you got the 20-30A, but the manufacturer says: 2.5Ah. See screenshot from the manufacturer's webpage, as based on the OP's attached photo of the battery.

author: themadhippy
author_rank: Super Contributor
timestamp: December 27, 2022, 05:48:49 pm
content: Id go with no one knows ,the battery pack claims 20v at 2.0AH ,but 4 x 3.7v is only 14.8V and 1500mah is a bit short of the claimed 2

author: ebastler
author_rank: Super Contributor
timestamp: December 27, 2022, 06:18:14 pm
content: Contrary to what the OP wrote, his photo shows 5 cells. So the 20V are close.The 2.5 Ah vs. 1.5Ah remains shady though. That must be the claimed "Up to 1.5X the capacity" at work...

author: Twoflower
author_rank: Frequent Contributor
timestamp: December 27, 2022, 06:28:55 pm
content: Get you units clarified. Ah and A are not the same. A 2.5Ah battery can provide 20A (for about 0.125 hours very simplified). The original thread asked for the amperage and not the capacity.And the picture shows 5 cells and not 4.There is a teardown of a craftsman 60V/2.5Ah pack which turns out to be a 3x 20V 2.5Ah pack. The cells look very different and are marked as LGABH?21865. Here is someone found some data for that cells:https://secondlifestorage.com/index.php?threads/lg-lgabhg21865-cell-specifications.8388/So the 20A re legit. and according to the voltages the 20V are also in range.Either the image of the cells are not from that pack or the pack is probably not original.

author: bastl_r
author_rank: Regular Contributor
timestamp: December 29, 2022, 05:03:00 pm
content: HiWhere do you read 2500mAh or probably LGHB2?The HB2 are allways, as on secondlifestorage decribed, with a brown wrap on them.In the picture you can see 1500mAh. They may be as powerful as 2500mAh but they last not for the same time.

author: ebastler
author_rank: Super Contributor
timestamp: December 29, 2022, 05:47:05 pm
content: Quote from: bastl_r on December 29, 2022, 05:03:00 pmCircled in yellow for your viewing pleasure in the picture a few posts above.As stated by the poster, the claim from the battery pack seller is at odds with the batteries inside.

author: Zero999
author_rank: Super Contributor
timestamp: December 30, 2022, 10:24:57 pm
content: Quote from: Thunderer on December 27, 2022, 05:48:08 pmA peak current of 20A to 30A seems sensible for a 2.5Ah lithium ion battery.

author: jogri
author_rank: Frequent Contributor
timestamp: December 30, 2022, 11:05:56 pm
content: If those batteries are already marked 1500 mAh they are probably among the cheapest and worst chinesium cells currently on the market. So i'd say a realistic max current for those cells (without them overheating in like five seconds) is maybe around 5 A?I would definitely not draw 10+ A, you can do that with proper 18650 cells from LG or Samsung without a problem, but not with extremely sketchy cells.

author: bastl_r
author_rank: Regular Contributor
timestamp: December 31, 2022, 10:27:55 am
content: It probably won't be quite that bad.With only 1500mAh, they have enough space for active material. Moreover, the device manufacturer has almost no influence on the current consumption. I therefore think that 20A is already in there. If in doubt, a hopefully installed temperature sensor should put an end to the game.Nevertheless, the 1500 cells are a rip-off.I think that of the specified 1500mAh eh only 1200 - 1300mAh will be usable --> 3min at 20A...

author: jogri
author_rank: Frequent Contributor
timestamp: December 31, 2022, 01:17:44 pm
content: What? No, that's not how batteries work. They don't have "more space", they just use a shitty cell chemistry. Yes, there are cells that are designed for high current and use a cell layout/chemistry optimised for that instead of high capacity, but those crappy cells definitely aren't.Also, your 20 A figure is VERY high for good cells and catastrophically high for that crap. As you've said yourself, that would be a 20 C discharge for those. LG/Samsung cells are normally rated for 10-20 C, i definitely wouldn't use more than 3-5 C for untested garbage.

author: NiHaoMike
author_rank: Super Contributor
timestamp: December 31, 2022, 02:51:08 pm
content: I never really liked the "compact" versions of power tool batteries. The larger ones put much less stress on the cells so they fail less often.

author: BeBuLamar
author_rank: Super Contributor
timestamp: December 31, 2022, 04:31:00 pm
content: Quote from: themadhippy on December 27, 2022, 05:48:49 pmThe pack has 5 cells but also look at the * at the bottom of this page and you seehttps://www.craftsman.com/product/cmcb202/v20-20ah-lithium-ion-battery"*20V MAX battery, maximum initial battery voltage (measured without a workload) is 20 volts. Nominal voltage is 18."