I just joined this forum as I´m building a 12v system for my recumbent (bike) and had had trouble finding a cheap and compact charger for Bosch´s BAT612 or third-party equivalent battery pack. I´ll be using these packs just to power e-bike lights, a navigation device and occasionally a phone with the aid of Bosch´s own step-down converter (model designation GAA 18V-24) that´s designed to power heated jackets and gadgets.
Obviously this is a fairly low-drain application, so I have no need for a bulky fast charger. I´ll be touring with a couple of spare battery packs anyway.
Firstly, I need to know the chemistry of the cells. Bosch´s website is scarce on technical specifications, but I think I saw a marketing blurb that mentioned iron phosphate, which means the pack has five LifePO4 cells in series, correct? Indeed, a reviewer on Amazon.fr reports that Bosch´s own AL 1820 CV charger is rated at 18v, which probably means a tad above that figure. But the rating on a third-party charger (link below) is 21v, suggesting it´s for polymer packs.
https://www.plus.parts/nl/compatibele-s ... ccu-s.html
So could somebody confirm what the guts of those packs are and point me toward an affordable and above all compact trickle charging alternative in the 0.5 to 1A range? I´m willing to simply time the charge with a multimeter using a mains adaptor with a suitable voltage and current rating.
Also, assuming the pack is iron phosphate, would I do much damage to the pack with a 21v/1A mains adapter as I found one of those (see link below)? I would be monitoring and/or timing the charge.
https://www.amazon.de/PowerSmart%C2%AE- ... C3%A4t+21v