Charge at 3.65v until current drops to .05C means charge at 3.65v until the current drops to 5 amps. You will find that means the cells will settle to 3.45v or close to it.What's wrong with 29 Volts it's 0.2 Volts lower than its operating Voltage. These batteries are made to be charged at 3.65 Volts per cell and 29 Divided by 8 is 3.625 Volts the Normal Cell Voltage is some what lower. But here are the Specs. If you think its a bad Idea to charge this High, tell me why? Most LIPO4 batteries are rated up to 4.2 Volts per cell but no one charges that High. I would Think this should be a safe top off Voltage.
Tell me if I am wrong and why?
Here is the web Site I got the info from.
Fortune Battery 100Ah
3.2V 100Ah Fortune LiFePO4 battery cells with more than 2500 cycles, 2C high continuous discharge rate, high energy density for Pure electric vehicles powewww.evlithium.com
Features of Fortune LiFePO4 Battery cells:
1. 2C 200A Continuous Discharge Current
2. 6C 600A Pulse Peak Current（10s)
3. Bolt Terminal Structure, easy to assembly
4. With Endcaps Protection
Capacity（Ah） 100 Product category Prismatic aluminum case Thickness（mm） 36 Width(mm) 130 Height(mm) 290 Nominal voltage(V) 3.2 Weight（Kg） 2.7 Standard current discharge（A） 0.5C Operating voltage range(V) 2.2～3.65 Operating temperature range(℃) -20～55 Maximum charge rate (Continued) 1C Maximum discharge rate (Continued) 2C Cycle life（times） 80%DOD≥2500 times
Precautions and Safety Instructions
1 Standard cell Precautions
a. Do not expose the cell to extreme heat or flame.
b. Do not short circuit, over-charge or over-discharge the cell.
c. Do not subject the cell to strong mechanical shocks.
d. Do not immerse the cell in water or sea water, or get it wet..
f. Do not disassemble or modify the cell.
g. Do not handle or store with metallic like necklaces, coins or hairpins, etc.
h. Do not use the cell with conspicuous damage or deformation.
i. Do not connect cell to the plug socket or car-cigarette-plug.
j. Do not make the direct soldering onto a cell.
k. Do not touch a leaked cell directly.
l. Do not use for other equipment.
m. Do not use Lithium-ion cell in mixture.
n. Do not use or leave the cell under the blazing sun (or in heated car by sunshine).
o. Keep cell away from children.
p. Do not drive a nail into the cell, strike it by hammer or tread it.
q. Do not give cell impact or fling it.
2.Cell Operation Instructions
2.1 Charging
a. Charge the cell in a temperature range of 0°C to + 50°C.
b. Charge the cell at a constant current of 0.3Cuntil 3.65V, and then at a constant voltage of 3.65V until
0.05C. Charge rates greater than 1C are NOT recommended. (C : Rated Capacity of cell)
c. Use a constant current, constant voltage (CC/CV) lithium-ion (Li+) cell charge controller.
d. Do not continue to charge cell over specified time. 。
2.2 Discharging
a. Recommended cut-off voltage to 2.2V. Recommended max continuous discharge current is 3C。
b. For maximum performance, discharge the cell in a temperature range of -20°C to +50°C.
2.3 Storage Recommendations
In case of long period storage (more than 3 months), storage the
cell at temperature range of –10 ~ +45°C, low humidity, no corrosive gas atmosphere，No press
on the cell；And more than 3 months need to put a charge according to the standard charge and
discharge process
I don't know why your cell bloated, but do not charge to 4.2v. Cycle them every 6 months. Cycle means discharge then charge. Do not discharge to 2.2v, 2.5v is more like it. Personally unless capacity testing, 3.0v is where I stop.
Edit to add, do not charge in series without a BMS (or discharge). You just learned why.
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