LordRover
SubscriberI picked up a cheap waeco raps 36 portable battery pack with dud batteries, in the short term i'll put some used batteries in but considering repacking it with lithium cells.
Would need to small possibly 18650 ? cells and a suitable BMS, anyone looked at doing similar ?
MY08 TDV6 SE D3- permagrin ooh yeah
2004 Jayco Freedom tin tent
1998 Triumph Daytona T595
1974 VW Kombi bus
1958 Holden FC special sedan
ChatterBox
No, but its a good idea!
I've got one of those battery packs which I've reloaded with AGM batteries at least once. When it dies, Lithium replacements would be a option worth looking at.
I suppose an issue could be recharging it. The old AGM batteries can be just hooked up to the main vehicle system and charged off the alternator. Lithium batteries would require a specific charger to get the correct charge profile etc?
LordRover
SubscriberYes, i think one of those buck converters might work for charging and would fit inside the lid quite easily. I'm getting a 40AH AGM for now but will look into a lithium upgrade for when it dies.
MY08 TDV6 SE D3- permagrin ooh yeah
2004 Jayco Freedom tin tent
1998 Triumph Daytona T595
1974 VW Kombi bus
1958 Holden FC special sedan
Master
A DC-DC converter should work. I recently purchased a small 8A 14.5VDC LFP charging unit from AliExpress that is about the size of a packet of smokes. I purchased it to allow a small outboard's alternator to top up a lithium bank without risking it frying. Haven't used it yet, but on paper these should make excellent LFP chargers at this output voltage.
Having said that, these won't protect from over discharge, so a small BMS may be a better choice if it can be made to fit.
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