Cold Cranking Amps are the total amount of amps that a battery can deliver at –18°C (0°F) for 30 seconds without dropping below 7.2 volts. Typical readings for a car range from 350 to 600A and higher for trucks.
We don't officially recommend wiring in series above 24V, due to cell-matching considerations. That said, real-world testing from our customers shows it working well above 24V, so we leave the choice to you — just note that wiring in series above 24V reduces your warranty to 2 years. Parallel connections are always fine.
Your car's alternator is fine for charging. For maintaining a battery when it's not in use, we recommend a charger designed for LiFePO4 — simply for convenience and peace of mind. You can use a standard lead-acid charger, but be careful: make sure it does not charge above 14.6V, does not have an automatic equalization mode, and ideally does not trickle charge once it's finished. Most lead-acid chargers use a CC/CV (Constant Current / Constant Voltage) algorithm — the same one used for LiFePO4 — so as long as the points above check out, a standard charger will work. A CC/CV charger starts in Constant Current mode, raising the voltage over time to hold a steady current; when the voltage reaches the upper cell limit, it switches to Constant Voltage mode, holding the maximum voltage while the current tapers off until it reaches a low value and the charge ends. The graph below shows the CC/CV algorithm (minus proper charge termination):
Yes we can special order different amp hour ratings that we do not currently have. Please shoot us an email if needing a different specification than our current offerings.
Yes please email us if needing a different size than currently listed.
It just means we don't have the data for your vehicle yet. If you'd like it added — and to check whether we have a battery that fits — just let us know and we'll add it to our database.
Unequivocally, no. The LiFePO4 chemistry is safer than the older lithium-ion chemistries. For more information, see: https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery#Safety
Yes all Arc-Angel Batteries have a BMS or Battery Management System which is designed to protect the battery from short-circuits, and provides charge protection, discharge protection, and voltage balancing. Our batteries for those who wish to know are top-balanced meaning the BMS balances at the top voltage range for LiFePO4 aka 3.65V instead of at the bottom.
