debricking a makita battary bl1415 - Page 1
Forum section: electronics / repair

author: loordgek
author_rank: Contributor
timestamp: January 20, 2020, 08:04:43 pm
content: helloi re celled a makita battery bl1415 but now it is brickedthe micro is a freescale/NXP MC908JK3ECDWEhttps://datasheet.octopart.com/MC908JK3ECDWE-Freescale-Semiconductor-datasheet-8932.pdfcan i read the micros flash (using a arduino) ? the data sheet mentions that you can read the flashi want read the it so i can see if it is only anti right to repair or is it doing morecan i reprogram the micro (using a arduino) so i can remove the bricked part?

author: BurningTantalum
author_rank: Frequent Contributor
timestamp: January 21, 2020, 09:46:05 am
content: Chinese replacement BMS pcbs are available for only a few Euros/$/£. I have repaired several packs with these pcbs and new cells and they work correctly. I doubt that the lock-out flag on the original pcb can be reset. The pack will lock out if it is connected to the charger 3 times with a below spec cell or cells, so if the pack is locked out it is imperative to dismantle it and charge the series cells from a PSU before using it and recharging on the charger.BT

author: Oldman79
author_rank: Contributor
timestamp: January 22, 2020, 08:03:50 am
content: Quote from: BurningTantalum on January 21, 2020, 09:46:05 amThanks for this information, I also have some bricked Makita batteries

author: loordgek
author_rank: Contributor
timestamp: January 24, 2020, 10:54:19 am
content: is that safe ?i heard from somebody who got some battery's from ali but they exploded. are the cells bad ?

author: ckambiselis
author_rank: Regular Contributor
timestamp: August 30, 2020, 08:02:16 am
content: Has anyone found any new info on resetting the lock out? There are possibilities that you could get a lock out while the cells are just fine, and I don't trust any cheap knock off PCBs that are available as a fix!Oscar

author: WaynesWorld
author_rank: Contributor
timestamp: September 01, 2020, 08:24:44 am
content: Hi all. I just registered, to comment in this thread, but I've been watching Dave's videos for the last 3 weeks and been meaning to join anyways.I am actually wanting to unbrick some batteries, including Makita and Hikoki/Hitachi.Milwaukee are easy - just put them on the OEM charger (once the cells are in range) for 10 seconds and they are good to go.I haven't had the same luck with Makita and Hikoki. Any clues?

author: coromonadalix
author_rank: Super Contributor
timestamp: September 01, 2020, 10:48:03 am
content: With all the china copy cats around, some makers have bms who communicate data with the chargers ... you can see all the pack life (temperature, charge discharge cycles etc ..)I had the chance to poke in DeWalt 20v and 20v/60v packs, saw many bms related problems in it, some cells are'nt equalized properly or not at all, and the pack became defective, saw some cells at 0.5 volts and the other where too high in voltages.The pcb in put in a insulating gel.One of the problems i see are the people badly connect them for a charge, they dont push completly the pack in the charger ... and the bms can not operate properlyand other people who left their pack in the car in the winter season ...Until someone crack this ..You're left with non genuine chargers to buy and non genuine batteries to buyYou'll have to sniff the data lines ...Some makers after x amount of discharges will deliberatly lock out the battery pack, saying they are done with their life expectancy.